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Abdallah, Mohamed Samy ; Aboona, Bassam ; Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. K. ; Agakishiev, G. ; Aggarwal, Ishu ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Aitbaev, A. ; Alekseev, I. ; Anderson, D. M. ; Aparin, A. ; Aschenauer, Elke Caroline ; Ashraf, M. U. ; Atetalla, F. G. ; Averichev, G. S. ; Bairathi, Vipul ; Baker, W. ; Ball Cap, Jonathan Gonzalo ; Barish, Kenneth ; Behera, A. ; Bellwied, Rene ; Bhagat, Pratibha ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bordyuzhin, I. G. ; Brandenburg, James D. ; Brandin, A. V. ; Cai, Xiang-Zhou ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chatterjee, A. ; Chattopadhyay, S. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Choudhury, Subikash ; Christie, William ; Chu, Xiaoxuan ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Dhamija, A. ; Di Carlo, L. ; Didenko, Lidia ; Dixit, Prabhupada ; Dong, X. ; Drachenberg, James Lucus ; Duckworth, Emilie ; Dunlop, James C. ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fawzi, F. M. ; Fazio, Salvatore ; Feng, C. J. ; Feng, Yicheng ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, A. ; Fu, C. ; Gagliardi, Carl A. ; Galatyuk, T. ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Gupta, Anik ; Guryn, Włodzimierz ; Hamed, Ahmed M. ; Han, Yiding ; Harabasz, Szymon ; Harasty, Matthew D. ; Harris, John W. ; Harrison, Hannah ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hu, C. ; Hu, Q. ; Hu, Y. ; Huang, H. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Huang, Y. ; Humanic, Thomas J. ; Isenhower, D. ; Isshiki, M. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Ju, Xin-Yue ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, S. ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, H. W. ; Keane, Declan ; Kechechyan, A. ; Kelsey, M. ; Kikoła, Daniel P. ; Kimelman, B. ; Kincses, D. ; Kisel, Ivan ; Kiselev, A. ; Klein, S. R. ; Knospe, Anders Garritt ; Ko, H. S. ; Kochenda, L. ; Korobitsin, A. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, P. ; Kumar, Lokesh ; Kumar, S. ; Elayavalli, R. Kunnawalkam ; Kwasizur, J. H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, A. ; Lednicky, R. ; Lee, J. H. ; Leung, Y. H. ; Lewis, N. ; Li, C. ; Li, C. ; Li, W. ; Li, X. ; Li, Y. ; Li, Y. ; Liang, X. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, H. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, W. J. ; Longacre, Ronald S. ; Loyd, E. ; Lu, T. ; Lukow, N. S. ; Luo, X. F. ; Ma, L. ; Ma, R. ; Ma, Y. G. ; Magdy Abdelwahab Abdelrahman, Niseem ; Mallick, D. ; Manukhov, S. L. ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, J. A. ; Minaev, N. G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Morozov, D. A. ; Mukherjee, A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, K. ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nishitani, R. ; Nogach, L. V. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Okubo, K. ; Page, Brian S. ; Pak, Robert ; Pan, J. ; Pandav, Ashish ; Pandey, A. K. ; Panebratsev, Yuri ; Parfenov, P. ; Paul, A. ; Pawlik, Bogdan ; Pawłowska, Diana ; Perkins, Chris ; Pluta, Jan Marian ; Pokhrel, B. R. ; Porter, J. ; Posik, Matthew ; Prozorova, V. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, A. ; Racz, Cameron ; Radhakrishnan, Sooraj Krishnan ; Raha, N. ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Robotkova, Monika ; Romero, J. L. ; Roy, D. ; Ruan, L. ; Sahoo, A. K. ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Samigullin, E. ; Sandweiss, J. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, B. R. ; Seck, F. ; Seger, Janet Elizabeth ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, E. ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shao, Tianhao ; Sharma, R. ; Sheikh, Ashik Ikbal ; Shen, D. Y. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, E. P. ; Sikora, R. ; Singh, J. ; Singha, Subhash ; Sinha, P. ; Skoby, Michael J. ; Smirnov, N. ; Söhngen, Yannick ; Solyst, W. ; Song, Y. ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. S. ; Stefaniak, Maria ; Stewart, David J. ; Strikhanov, M. ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, D. N. ; Sweger, Zachary W. ; Szymanski, P. ; Tang, Aihong ; Tang, Zebo ; Taranenko, A. ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Todoroki, Takahito ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Truhlar, Tomas ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, A. N. ; Vassiliev, Iouri ; Verkest, Veronica ; Videbæk, Flemming ; Vokal, S. ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, X. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, J. ; Wu, J. ; Wu, Y. ; Xi, B. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yan, G. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, Wangmei ; Zhang, C. ; Zhang, D. ; Zhang, J. ; Zhang, S. ; Zhang, S. ; Zhang, Y. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, F. ; Zhao, J. ; Zhao, M. ; Zhou, C. ; Zhou, Y. ; Zhu, X. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
A linearly polarized photon can be quantized from the Lorentz-boosted electromagnetic field of a nucleus traveling at ultrarelativistic speed. When two relativistic heavy nuclei pass one another at a distance of a few nuclear radii, the photon from one nucleus may interact through a virtual quark-antiquark pair with gluons from the other nucleus, forming a short-lived vector meson (e.g., ρ0). In this experiment, the polarization was used in diffractive photoproduction to observe a unique spin interference pattern in the angular distribution of ρ0 → π+π− decays. The observed interference is a result of an overlap of two wave functions at a distance an order of magnitude larger than the ρ0 travel distance within its lifetime. The strong-interaction nuclear radii were extracted from these diffractive interactions and found to be 6.53 ± 0.06 fm (197Au) and 7.29 ± 0.08 fm (238U), larger than the nuclear charge radii. The observable is demonstrated to be sensitive to the nuclear geometry and quantum interference of nonidentical particles. Polarized photon-gluon fusion reveals quantum wave interference of non-identical particles and shape of high-energy nuclei.
Abdallah, Mohamed Samy ; Aboona, Bassam ; Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Aggarwal, Ishu ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Anderson, Derek M. ; Aschenauer, Elke Caroline ; Atchison, J. ; Bairathi, Vipul ; Baker, W. ; Ball Cap, Jonathan Gonzalo ; Barish, Kenneth ; Bellwied, Rene ; Bhagat, Pratibha ; Bhasin, Anju ; Bhatta, Somadutta ; Bielčík, Jaroslav ; Bielčíková, Jana ; Brandenburg, James D. ; Cai, Xiang-Zhou ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, Z. ; Chatterjee, A. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cheng, Y. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Dale-Gau, G. ; Daugherity, M. ; Deppner, Ingo Martin ; Dhamija, A. ; Di Carlo, L. ; Didenko, Lidia ; Dixit, Prabhupada ; Dong, X. ; Drachenberg, James Lucus ; Duckworth, Emilie ; Dunlop, James C. ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fawzi, F. M. ; Fazio, Salvatore ; Feng, C. J. ; Feng, Yicheng ; Finch, Evan ; Fisyak, Yuri V. ; Fu, C. ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Gupta, Anik ; Guryn, Włodzimierz ; Hamed, Ahmed M. ; Han, Y. ; Harabasz, Szymon ; Harasty, Matthew D. ; Harris, John W. ; Harrison, Hannah ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hu, C. ; Hu, Q. ; Hu, Y. ; Huang, H. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Huang, Y. ; Humanic, Thomas J. ; Isenhower, D. ; Isshiki, M. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jin, C. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kimelman, B. ; Kincses, D. ; Kisel, Ivan ; Kiselev, A. ; Knospe, Anders Garritt ; Ko, H. S. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kumar, Lokesh ; Kumar, Shyam ; Elayavalli, R. Kunnawalkam ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lee, J. H. ; Leung, Y. H. ; Lewis, N. ; Li, C. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Li, Y. ; Li, Z. ; Liang, X. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, H. ; Liu, T. ; Liu, X. ; Liu, Y. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Loyd, E. ; Lu, T. ; Lukow, N. S. ; Luo, X. F. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; McNamara, Grant ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Mukherjee, A. ; Nagy, M. I. ; Nain, A. S. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Niida, Takafumi ; Nishitani, R. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okubo, K. ; Page, Brian S. ; Pak, Robert ; Pan, Jinjin ; Pandav, Ashish ; Pandey, Ashutosh Kumar ; Pani, T. ; Paul, A. ; Pawlik, Bogdan ; Pawłowska, Diana ; Perkins, Chris ; Pluta, Jan Marian ; Pokhrel, B. R. ; Porter, Jeffrey Brent ; Posik, Matthew ; Protzman, Tristan ; Prozorova, V. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qin, Z. ; Qiu, H. ; Quintero, Amilkar ; Racz, Cameron ; Radhakrishnan, Sooraj Krishnan ; Raha, N. ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Robotkova, Monika ; Romero, Juan L. ; Roy, D. ; Chowdhury, P. Roy ; Ruan, L. ; Sahoo, A. K. ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Seck, F-J. ; Seger, Janet Elizabeth ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shao, T. ; Sharma, R. ; Sheikh, Ashik Ikbal ; Shen, D. Y. ; Shen, K. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Singh, J. ; Singha, Subhash ; Sinha, P. ; Skoby, Michael J. ; Smirnov, Nikolai ; Söhngen, Yannick ; Solyst, William ; Song, Y. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Sun, C. ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Sweger, Zachary W. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Todoroki, Takahito ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Truhlar, Tomas ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Tsang, C. Y. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vassiliev, Iouri ; Verkest, Veronica ; Videbæk, Flemming ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, X. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Westfall, Gary D. ; Wielanek, Daniel ; Wieman, Howard ; Wilks, G. ; Wissink, Scott W. ; Witt, Richard ; Wu, J. ; Wu, J. ; Wu, Xiao ; Wu, Y. ; Xi, B. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yan, G. ; Yan, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, C. ; Zhang, D. ; Zhang, J. ; Zhang, S. ; Zhang, S. ; Zhang, Y. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, F. ; Zhao, J. ; Zhao, M. ; Zhou, C. ; Zhou, J. ; Zhou, Y. ; Zhu, X. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
We report the measurement of K∗0 meson at midrapidity (|y|< 1.0) in Au+Au collisions at sNN−−−√~=~7.7, 11.5, 14.5, 19.6, 27 and 39 GeV collected by the STAR experiment during the RHIC beam energy scan (BES) program. The transverse momentum spectra, yield, and average transverse momentum of K∗0 are presented as functions of collision centrality and beam energy. The K∗0/K yield ratios are presented for different collision centrality intervals and beam energies. The K∗0/K ratio in heavy-ion collisions are observed to be smaller than that in small system collisions (e+e and p+p). The K∗0/K ratio follows a similar centrality dependence to that observed in previous RHIC and LHC measurements. The data favor the scenario of the dominance of hadronic re-scattering over regeneration for K∗0 production in the hadronic phase of the medium.
Measurement of inclusive J/ψ polarization in p + p collisions at √s=200 GeV by the STAR experiment
(2020)
Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Bueltmann, S. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chen, D. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cherney, Michael Gerard ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Didenko, Lidia ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Edmonds, Terrence ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esha, Roli ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Gibson, Adam ; Gopal, Krishan ; Grosnick, David P. ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Harris, John W. ; He, S. ; He, W. ; He, X. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hong, Y. ; Horvat, S. ; Hu, Y. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Humanic, Thomas J. ; Huo, P. ; Igo, George J. ; Isenhower, D. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; JI, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jowzaee, S. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kinghorn, Todd Adler ; Kisel, Ivan ; Kiselev, A. ; Kisiel, Adam Ryszard ; Kocan, Michal ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Krueger, Keith William ; Kulathunga Mudiyanselage, Nalinda ; Kumar, Lokesh ; Kunnawalkam Elayavalli, R. ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Lukow, N. S. ; Luo, S. ; Luo, X. ; Ma, G. L. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Moravcova, Zuzana ; Morozov, Dmitry A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Panebratsev, Yuri ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Porter, Jeffrey Brent ; Posik, Matthew ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Radhakrishnan, Sooraj Krishnan ; Ramachandran, Suvarna ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Roberts, Jabus B. ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shen, F. ; Shen, W. Q. ; Shi, Shusu ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Smirnov, Nikolai ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, Y. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. F. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Yang, Z. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhong, C. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
We report on new measurements of inclusive 𝐽/𝜓 polarization at midrapidity in 𝑝+𝑝 collisions at √𝑠=200 GeV by the STAR experiment at the Relativistic Heavy Ion Collider. The polarization parameters, 𝜆𝜃, 𝜆𝜙, and 𝜆𝜃𝜙, are measured as a function of transverse momentum (𝑝T) in both the helicity and Collins-Soper (CS) reference frames within 𝑝T<10 GeV/𝑐. Except for 𝜆𝜃 in the CS frame at the highest measured 𝑝T, all three polarization parameters are consistent with 0 in both reference frames without any strong 𝑝T dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with nonrelativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.
Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chen, D. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cherney, Michael Gerard ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Didenko, Lidia ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Edmonds, Terrence ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esha, Roli ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Gibson, Adam ; Gopal, Krishan ; Grosnick, David P. ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Harabasz, Szymon ; Harris, John W. ; He, S. ; He, W. ; He, X. H. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hong, Y. ; Horvat, S. ; Hu, Y. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Humanic, Thomas J. ; Huo, P. ; Igo, George J. ; Isenhower, D. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; JI, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jowzaee, S. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kinghorn, Todd Adler ; Kisel, Ivan ; Kiselev, A. ; Kisiel, Adam Ryszard ; Kocan, Michal ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Krueger, Keith William ; Kulathunga Mudiyanselage, Nalinda ; Kumar, Lokesh ; Kunnawalkam Elayavalli, R. ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Lukow, N. S. ; Luo, S. ; Luo, X. ; Ma, G. L. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Moravcova, Zuzana ; Morozov, Dmitry A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Panebratsev, Yuri ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Porter, Jeffrey Brent ; Posik, Matthew ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Radhakrishnan, Sooraj Krishnan ; Ramachandran, Suvarna ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Roberts, Jabus B. ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shen, F. ; Shen, W. Q. ; Shi, Shusu ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Smirnov, Nikolai ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, Y. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. F. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Yang, Z. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhong, C. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
We report on the measurement of the Central Exclusive Production of charged particle pairs h+h− (h = π, K, p) with the STAR detector at RHIC in proton-proton collisions at √s = 200 GeV. The charged particle pairs produced in the reaction pp → p′ + h+h− + p′ are reconstructed from the tracks in the central detector and identified using the specific energy loss and the time of flight method, while the forward-scattered protons are measured in the Roman Pot system. Exclusivity of the event is guaranteed by requiring the transverse momentum balance of all four final-state particles. Differential cross sections are measured as functions of observables related to the central hadronic final state and to the forward-scattered protons. They are measured in a fiducial region corresponding to the acceptance of the STAR detector and determined by the central particles’ transverse momenta and pseudorapidities as well as by the forward-scattered protons’ momenta. This fiducial region roughly corresponds to the square of the four-momentum transfers at the proton vertices in the range 0.04 GeV2 < −t1, −t2 < 0.2 GeV2, invariant masses of the charged particle pairs up to a few GeV and pseudorapidities of the centrally-produced hadrons in the range |η| < 0.7. The measured cross sections are compared to phenomenological predictions based on the Double Pomeron Exchange (DPE) model. Structures observed in the mass spectra of π+π− and K+K− pairs are consistent with the DPE model, while angular distributions of pions suggest a dominant spin-0 contribution to π+π− production. For π+π− production, the fiducial cross section is extrapolated to the Lorentz-invariant region, which allows decomposition of the invariant mass spectrum into continuum and resonant contributions. The extrapolated cross section is well described by the continuum production and at least three resonances, the f0(980), f2(1270) and f0(1500), with a possible small contribution from the f0(1370). Fits to the extrapolated differential cross section as a function of t1 and t2 enable extraction of the exponential slope parameters in several bins of the invariant mass of π+π− pairs. These parameters are sensitive to the size of the interaction region.
Abdallah, Mohamed Samy ; Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Ishu ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Baker, W. ; Ball Cap, Jonathan Gonzalo ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhagat, Pratibha ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Bunzarov, Ivan ; Butterworth, Joseph ; Cai, Xiang-Zhou ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chattopadhyay, S. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Dhamija, A. ; Di Carlo, L. ; Didenko, Lidia ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fawzi, F. M. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fu, C. ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Gupta, Anik ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Han, Y. ; Harabasz, Szymon ; Harasty, Matthew D. ; Harris, John W. ; Harrison, Hannah ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hu, Y. ; Huang, H. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Huang, Y. ; Humanic, Thomas J. ; Isenhower, D. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kisel, Ivan ; Kiselev, A. ; Knospe, Anders Garritt ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Kumar, Lokesh ; Kumar, Shyam ; Kunnawalkam Elayavalli, R. ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, C. ; Li, W. ; Li, X. ; Li, Y. ; Liang, X. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Loyd, E. ; Lukow, N. S. ; Luo, X. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Morozov, Dmitry A. ; Mukherjee, A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nishitani, R. ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Pandey, Ashutosh Kumar ; Panebratsev, Yuri ; Parfenov, P. ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Pokhrel, B. R. ; Ponimatkin, G. ; Porter, Jeffrey Brent ; Posik, Matthew ; Prozorova, V. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Racz, Cameron ; Radhakrishnan, Sooraj Krishnan ; Raha, N. ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Robotkova, Monika ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shao, T. ; Sheikh, Ashik Ikbal ; Shen, D. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Skoby, Michael J. ; Smirnov, Nikolai ; Söhngen, Yannick ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Sweger, Zachary W. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Todoroki, Takahito ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Truhlar, Tomas ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Verkest, Veronica ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, J. ; Wu, Y. ; Xi, B. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, C. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
We report high-precision measurements of the longitudinal double-spin asymmetry, 𝐴𝐿𝐿, for midrapidity inclusive jet and dijet production in polarized 𝑝𝑝 collisions at a center-of-mass energy of √𝑠=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δ𝑔(𝑥,𝑄2), for gluon momentum fractions in the range from 𝑥≃0.05 to 𝑥≃0.5, while the new dijet data provide further constraints on the 𝑥 dependence of Δ𝑔(𝑥,𝑄2). The results are in good agreement with previous measurements at √𝑠=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δ𝑔(𝑥,𝑄2) is positive for 𝑥>0.05.
Measurement of inclusive charged-particle jet production in Au+Au collisions at √sNN = 200 GeV
(2021)
Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chen, D. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cherney, Michael Gerard ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Didenko, Lidia ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Edmonds, Terrence ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esha, Roli ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Gibson, Adam ; Gopal, Krishan ; Grosnick, David P. ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Harabasz, Szymon ; Harris, John W. ; He, S. ; He, W. ; He, X. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hong, Y. ; Horvat, S. ; Hu, Y. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Humanic, Thomas J. ; Huo, P. ; Igo, George J. ; Isenhower, D. ; Jacobs, Peter Martin ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; JI, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jowzaee, S. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kinghorn, Todd Adler ; Kisel, Ivan ; Kiselev, A. ; Kisiel, Adam Ryszard ; Kocan, Michal ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Krueger, Keith William ; Mudiyanselage, N. Kulathunga ; Kumar, Lokesh ; Elayavalli, R. Kunnawalkam ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Lukow, N. S. ; Luo, S. ; Luo, X. ; Ma, G. L. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Moravcova, Zuzana ; Morozov, Dmitry A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Panebratsev, Yuri ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Porter, Jeffrey Brent ; Posik, Matthew ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Radhakrishnan, Sooraj Krishnan ; Ramachandran, Suvarna ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Roberts, Jabus B. ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shen, F. ; Shen, W. Q. ; Shi, Shusu ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Smirnov, Nikolai ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, Y. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. F. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Yang, Z. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhong, C. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
The STAR Collaboration at the Relativistic Heavy Ion Collider reports the first measurement of inclusive jet production in peripheral and central Au+Au collisions at sNN−−−−√=200 GeV. Jets are reconstructed with the anti-kT algorithm using charged tracks with pseudorapidity |η|<1.0 and transverse momentum 0.2<pchT,jet<30 GeV/c, with jet resolution parameter R=0.2, 0.3, and 0.4. The large background yield uncorrelated with the jet signal is observed to be dominated by statistical phase space, consistent with a previous coincidence measurement. This background is suppressed by requiring a high-transverse-momentum (high-pT) leading hadron in accepted jet candidates. The bias imposed by this requirement is assessed, and the pT region in which the bias is small is identified. Inclusive charged-particle jet distributions are reported in peripheral and central Au+Au collisions for 5<pchT,jet<25 GeV/c and 5<pchT,jet<30 GeV/c, respectively. The charged-particle jet inclusive yield is suppressed for central Au+Au collisions, compared to both the peripheral Au+Au yield from this measurement and to the pp yield calculated using the PYTHIA event generator. The magnitude of the suppression is consistent with that of inclusive hadron production at high pT, and that of semi-inclusive recoil jet yield when expressed in terms of energy loss due to medium-induced energy transport. Comparison of inclusive charged-particle jet yields for different values of R exhibits no significant evidence for medium-induced broadening of the transverse jet profile for R<0.4 in central Au+Au collisions. The measured distributions are consistent with theoretical model calculations that incorporate jet quenching.
Abdallah, Mohamed Samy ; Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Ishu ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Baker, W. ; Ball Cap, Jonathan Gonzalo ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhagat, Pratibha ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Bunzarov, Ivan ; Butterworth, Joseph ; Cai, Xiang-Zhou ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chattopadhyay, S. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Dhamija, A. ; Di Carlo, L. ; Didenko, Lidia ; Dixit, Prabhupada ; Dong, X. ; Drachenberg, James Lucus ; Duckworth, Emilie ; Dunlop, James C. ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fawzi, F. M. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fu, C. ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Gupta, Anik ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Han, Y. ; Harabasz, Szymon ; Harasty, Matthew D. ; Harris, John W. ; Harrison, Hannah ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hu, Y. ; Huang, H. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Huang, Y. ; Humanic, Thomas J. ; Igo, George J. ; Isenhower, D. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kisel, Ivan ; Kiselev, A. ; Knospe, Anders Garritt ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Kumar, Lokesh ; Kumar, Shyam ; Elayavalli, R. Kunnawalkam ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, C. ; Li, W. ; Li, X. ; Li, Y. ; Liang, X. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, H. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Loyd, E. ; Lukow, N. S. ; Luo, X. F. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Morozov, Dmitry A. ; Mukherjee, A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nishitani, R. ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Pandey, Ashutosh Kumar ; Panebratsev, Yuri ; Parfenov, P. ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Pokhrel, B. R. ; Ponimatkin, G. ; Porter, Jeffrey Brent ; Posik, Matthew ; Prozorova, V. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Racz, Cameron ; Radhakrishnan, Sooraj Krishnan ; Raha, N. ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Robotkova, Monika ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Roy, D. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shao, T. ; Sheikh, Ashik Ikbal ; Shen, D. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Skoby, Michael J. ; Smirnov, Nikolai ; Söhngen, Yannick ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Sweger, Zachary W. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Todoroki, Takahito ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Truhlar, Tomas ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Verkest, Veronica ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Wu, J. ; Wu, Y. ; Xi, B. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, C. ; Zhang, D. ; Zhang, J. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
Elliptic flow measurements from two-, four- and six-particle correlations are used to investigate flow fluctuations in collisions of U+U at sNN−−−√ = 193 GeV, Cu+Au at sNN−−−√ = 200 GeV and Au+Au spanning the range sNN−−−√ = 11.5 - 200 GeV. The measurements show a strong dependence of the flow fluctuations on collision centrality, a modest dependence on system size, and very little if any, dependence on particle species and beam energy. The results, when compared to similar LHC measurements, viscous hydrodynamic calculations, and Glauber model eccentricities, indicate that initial-state-driven fluctuations predominate the flow fluctuations generated in the collisions studied.
Measurement of inclusive charged-particle jet production in Au + Au collisions at √sNN=200 GeV
(2020)
Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chen, D. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cherney, Michael Gerard ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Didenko, Lidia ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Edmonds, Terrence ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esha, Roli ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Gibson, Adam ; Gopal, Krishan ; Grosnick, David P. ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Harabasz, Szymon ; Harris, John W. ; He, S. ; He, W. ; He, X. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hong, Y. ; Horvat, S. ; Hu, Y. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Humanic, Thomas J. ; Huo, P. ; Igo, George J. ; Isenhower, D. ; Jacobs, Peter Martin ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; JI, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jowzaee, S. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kinghorn, Todd Adler ; Kisel, Ivan ; Kiselev, A. ; Kisiel, Adam Ryszard ; Kocan, Michal ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Krueger, Keith William ; Kulathunga Mudiyanselage, Nalinda ; Kumar, Lokesh ; Kunnawalkam Elayavalli, R. ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Lukow, N. S. ; Luo, S. ; Luo, X. ; Ma, G. L. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Moravcova, Zuzana ; Morozov, Dmitry A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Panebratsev, Yuri ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Porter, Jeffrey Brent ; Posik, Matthew ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Radhakrishnan, Sooraj Krishnan ; Ramachandran, Suvarna ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Roberts, Jabus B. ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shen, F. ; Shen, W. Q. ; Shi, Shusu ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Smirnov, Nikolai ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, Y. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. F. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Yang, Z. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhong, C. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
The STAR Collaboration at the Relativistic Heavy Ion Collider reports the first measurement of inclusive jet production in peripheral and central Au+Au collisions at √𝑠𝑁𝑁=200 GeV. Jets are reconstructed with the anti-𝑘𝑇 algorithm using charged tracks with pseudorapidity |𝜂|<1.0 and transverse momentum 0.2<𝑝ch
𝑇,jet<30 GeV/𝑐, with jet resolution parameter 𝑅=0.2, 0.3, and 0.4. The large background yield uncorrelated with the jet signal is observed to be dominated by statistical phase space, consistent with a previous coincidence measurement. This background is suppressed by requiring a high-transverse-momentum (high-𝑝𝑇) leading hadron in accepted jet candidates. The bias imposed by this requirement is assessed, and the 𝑝𝑇 region in which the bias is small is identified. Inclusive charged-particle jet distributions are reported in peripheral and central Au+Au collisions for 5<𝑝ch
𝑇,jet<25 GeV/𝑐 and 5<𝑝ch
𝑇,jet<30 GeV/𝑐, respectively. The charged-particle jet inclusive yield is suppressed for central Au+Au collisions, compared to both the peripheral Au+Au yield from this measurement and to the 𝑝𝑝 yield calculated using the PYTHIA event generator. The magnitude of the suppression is consistent with that of inclusive hadron production at high 𝑝𝑇 and that of semi-inclusive recoil jet yield when expressed in terms of energy loss due to medium-induced energy transport. Comparison of inclusive charged-particle jet yields for different values of 𝑅 exhibits no significant evidence for medium-induced broadening of the transverse jet profile for 𝑅 <0.4 in central Au+Au collisions. The measured distributions are consistent with theoretical model calculations that incorporate jet quenching.
Adam, Jaroslav ; Adamczyk, Leszek ; Adams, Joseph R. ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Anderson, Derek M. ; Aparin, Alexey ; Aschenauer, Elke Caroline ; Ashraf, Muhammad Usman ; Atetalla, F. G. ; Attri, Anjali ; Averichev, Georgy S. ; Bairathi, Vipul ; Barish, Kenneth ; Behera, Arabinda ; Bellwied, Rene ; Bhasin, Anju ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Brandenburg, James D. ; Brandin, Andrei V. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, F-H. ; Chang, Z. ; Chankova-Bunzarova, N. ; Chatterjee, A. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cherney, Michael Gerard ; Chevalier, M. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Dedovich, T. G. ; Deppner, Ingo Martin ; Derevschikov, Anatoly A. ; Didenko, Lidia ; Dilks, Christopher ; Dong, X. ; Drachenberg, James Lucus ; Dunlop, James C. ; Edmonds, Terrence ; Elsey, Nicholas ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Federič, Pavol ; Fedorišin, Jan ; Feng, C. J. ; Feng, Yicheng ; Filip, Peter ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fulek, Łukasz ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Guryn, Włodzimierz ; Hamad, A. I. ; Hamed, Ahmed M. ; Harabasz, Szymon ; Harris, John W. ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hong, Y. ; Horvat, S. ; Hu, Y. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Humanic, Thomas J. ; Huo, P. ; Igo, George J. ; Isenhower, D. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jowzaee, S. ; Ju, X. ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kim, C. ; Kimelman, B. ; Kincses, D. ; Kinghorn, Todd Adler ; Kisel, Ivan ; Kiselev, A. ; Kocan, Michal ; Kočenda, L. M. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kravtsov, Peter ; Krueger, Keith William ; Kulathunga Mudiyanselage, Nalinda ; Kumar, Lokesh ; Kumar, Shyam ; Kunnawalkam Elayavalli, R. ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J. H. ; Leung, Y. H. ; Li, C. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, P. ; Liu, P. ; Liu, T. ; Liu, X. ; Liu, Y. ; Liu, Z. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Lukow, N. S. ; Luo, S. ; Luo, X. ; Ma, G. L. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Majka, Richard Daniel ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Moravcova, Zuzana ; Morozov, Dmitry A. ; Nagy, M. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Nigmatkulov, Grigory A. ; Niida, Takafumi ; Nogach, Larisa V. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okorokov, Vitaly A. ; Page, Brian S. ; Pak, Robert ; Pandav, Ashish ; Panebratsev, Yuri ; Pawlik, Bogdan ; Pawłowska, Diana ; Pei, Hua ; Perkins, Chris ; Pinsky, Lawrence ; Pintér, Roland Laszlo ; Pluta, Jan Marian ; Pokhrel, B. R. ; Porter, Jeffrey Brent ; Posik, Matthew ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Radhakrishnan, Sooraj Krishnan ; Ramachandran, Suvarna ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ruan, L. ; Rusnak, Jan ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sandweiss, Jack H. ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Schweid, Benjamin R. ; Seck, Florian ; Seger, Janet Elizabeth ; Sergeeva, Maria ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Sheikh, Ashik Ikbal ; Shen, W. Q. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Šimko, Miroslav ; Singh, J. ; Singha, Subhash ; Smirnov, Nikolai ; Solyst, William ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stefaniak, Maria ; Stewart, David J. ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Summa, Branden ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Svirida, Dmitry N. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Taranenko, Arkadiy ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Tsai, Oleg D. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vasiliev, Alexander Nikolaevich ; Vassiliev, Iouri ; Videbæk, Flemming ; Vokal, Stanislav ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Wen, L. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, Y. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. F. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Yang, Z. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, C. ; Zhang, D. ; Zhang, S. ; Zhang, S. ; Zhang, X. P. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, J. ; Zhong, C. ; Zhou, C. ; Zhu, X. ; Zhu, Z. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
The STAR Collaboration reports measurements of the transverse single-spin asymmetry (TSSA) of inclusive 𝜋0 at center-of-mass energies (√𝑠) of 200 GeV and 500 GeV in transversely polarized proton-proton collisions in the pseudo-rapidity region 2.7 to 4.0. The results at the two different energies show a continuous increase of the TSSA with Feynman-𝑥, and, when compared to previous measurements, no dependence on √𝑠 from 19.4 GeV to 500 GeV is found. To investigate the underlying physics leading to this large TSSA, different topologies have been studied. 𝜋0 with no nearby particles tend to have a higher TSSA than inclusive 𝜋0. The TSSA for inclusive electromagnetic jets, sensitive to the Sivers effect in the initial state, is substantially smaller, but shows the same behavior as the inclusive 𝜋0 asymmetry as a function of Feynman-𝑥. To investigate final-state effects, the Collins asymmetry of 𝜋0 inside electromagnetic jets has been measured. The Collins asymmetry is analyzed for its dependence on the 𝜋0 momentum transverse to the jet thrust axis and its dependence on the fraction of jet energy carried by the 𝜋0. The asymmetry was found to be small in each case for both center-of-mass energies. All the measurements are compared to QCD-based theoretical calculations for transverse-momentum-dependent parton distribution functions and fragmentation functions. Some discrepancies are found, which indicates new mechanisms might be involved.
Abdallah, Mohamed Samy ; Aboona, Bassam ; Adam, Jaroslav ; Adamczyk, Leszek ; Adams, J. R. ; Adkins, J. Kevin ; Aggarwal, Ishu ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Anderson, Derek M. ; Aschenauer, Elke Caroline ; Atchison, J. ; Bai, X. ; Bairathi, Vipul ; Baker, W. ; Ball Cap, Jonathan Gonzalo ; Barish, Kenneth ; Bellwied, Rene ; Bhagat, Pratibha ; Bhasin, Anju ; Bhatta, Somadutta ; Bielčík, Jaroslav ; Bielčíková, Jana ; Brandenburg, James D. ; Cai, Xiang-Zhou ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Cebra, Daniel A. ; Chakaberia, Irakli ; Chaloupka, Petr ; Chan, B. K. ; Chang, Z. ; Chatterjee, A. ; Chattopadhyay, S. ; Chen, D. ; Chen, J. ; Chen, J. H. ; Chen, X. ; Chen, Z. ; Cheng, J. ; Cheng, Y. ; Choudhury, Subikash ; Christie, William ; Chu, X. ; Crawford, Henry J. ; Csanád, Máté ; Daugherity, M. ; Deppner, Ingo Martin ; Dhamija, A. ; Di Carlo, L. ; Didenko, Lidia ; Dixit, Prabhupada ; Dong, X. ; Drachenberg, James Lucus ; Duckworth, Emilie ; Dunlop, James C. ; Engelage, Jon M. ; Eppley, Geary Wareham ; Esumi, ShinIchi ; Evdokimov, Olga Y. ; Ewigleben, A. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fawzi, F. M. ; Fazio, Salvatore ; Feng, C. J. ; Feng, Yicheng ; Finch, Evan ; Fisyak, Yuri V. ; Francisco, Audrey ; Fu, C. ; Gagliardi, Carl A. ; Galatyuk, Tetyana ; Geurts, Frank ; Ghimire, Navagyan ; Gibson, Adam ; Gopal, Krishan ; Gou, X. ; Grosnick, David P. ; Gupta, Anik ; Guryn, Włodzimierz ; Hamed, Ahmed M. ; Han, Y. ; Harabasz, Szymon ; Harasty, Matthew D. ; Harris, John W. ; Harrison, Hannah ; He, S. ; He, W. ; He, X. H. ; He, Y. ; Heppelmann, S. ; Herrmann, Norbert ; Hoffman, E. ; Holub, Lukáš ; Hu, C. ; Hu, Q. ; Hu, Y. ; Huang, H. ; Huang, Huan Zhong ; Huang, Shengli ; Huang, T. ; Huang, X. ; Huang, Y. ; Humanic, Thomas J. ; Isenhower, D. ; Isshiki, M. ; Jacobs, William W. ; Jena, Chitrasen ; Jentsch, Alexander ; Ji, Yuanjing ; Jia, Jiangyong ; Jiang, K. ; Jin, C. ; Ju, Xin-Yue ; Judd, Eleanor G. ; Kabana, Sonia ; Kabir, M. L. ; Kagamaster, Skipper ; Kalinkin, Dmitry ; Kang, K. ; Kapukchyan, David ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kelsey, Matthew ; Khyzhniak, Yevheniia V. ; Kikoła, Daniel P. ; Kimelman, B. ; Kincses, D. ; Kisel, Ivan ; Kiselev, A. ; Knospe, Anders Garritt ; Ko, H. S. ; Kosarzewski, Leszek Krzysztof ; Kramarik, L. ; Kumar, Lokesh ; Kumar, Shyam ; Elayavalli, R. Kunnawalkam ; Kwasizur, Joseph H. ; Lacey, Roy Alphanso ; Lan, Shaowei ; Landgraf, Jeffery M. ; Lauret, Jerome ; Lebedev, Alexei ; Lee, J. H. ; Leung, Y. H. ; Lewis, N. ; Li, C. ; Li, C. ; Li, W. ; Li, W. ; Li, X. ; Li, Y. ; Li, Y. ; Li, Z. ; Liang, X. ; Liang, Y. ; Licenik, Robert ; Lin, T. ; Lin, Y. ; Lisa, Michael A. ; Liu, F. ; Liu, H. ; Liu, H. ; Liu, T. ; Liu, X. ; Liu, Y. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Longacre, Ronald S. ; Loyd, E. ; Lu, T. ; Lukow, N. S. ; Luo, X. F. ; Ma, L. ; Ma, R. ; Ma, Yu-Gang ; Magdy Abdelwahab Abdelrahman, Niseem ; Mallick, Dukhishyam ; Margetis, Spyridon ; Markert, Christina ; Matis, Howard S. ; Mazer, Joel Anthony ; McNamara, Grant ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mouli, Mriganka Mouli ; Mooney, Isaac A. ; Mukherjee, A. ; Nagy, M. I. ; Nain, A. S. ; Nam, J. D. ; Nasim, Md. ; Nayak, Kishora ; Neff, D. ; Nelson, John M. ; Nemes, Daniel B. ; Nie, M. ; Niida, Takafumi ; Nishitani, R. ; Nonaka, Toshihiro ; Nunes, A. S. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Saehanseul ; Okubo, K. ; Page, Brian S. ; Pak, Robert ; Pan, Jinjin ; Pandav, Ashish ; Pandey, Ashutosh Kumar ; Pani, T. ; Paul, A. ; Pawlik, Bogdan ; Pawłowska, Diana ; Perkins, Chris ; Pluta, Jan Marian ; Pokhrel, B. R. ; Porter, Jeffrey Brent ; Posik, Matthew ; Protzman, Tristan ; Prozorova, V. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qin, Z. ; Qiu, H. ; Quintero, Amilkar ; Racz, Cameron ; Radhakrishnan, Sooraj Krishnan ; Raha, N. ; Ray, Robert L. ; Reed, Rosi Jan ; Ritter, Hans Georg ; Robotkova, Monika ; Romero, Juan L. ; Roy, D. ; Chowdhury, P. Roy ; Ruan, L. ; Sahoo, A. K. ; Sahoo, Nihar Ranjan ; Sako, H. ; Salur, Sevil ; Sato, Susumu ; Schmidke, William B. ; Schmitz, Norbert ; Seck, F-J. ; Seger, Janet Elizabeth ; Seto, Richard ; Seyboth, Peter ; Shah, N. ; Shanmuganathan, Prashanth V. ; Shao, M. ; Shao, T. ; Sharma, R. ; Sheikh, Ashik Ikbal ; Shen, D. Y. ; Shen, K. ; Shi, Shusu ; Shi, Y. ; Shou, Q. Y. ; Sichtermann, Ernst P. ; Sikora, Rafał ; Singh, J. ; Singha, Subhash ; Sinha, P. ; Skoby, Michael J. ; Smirnov, Nikolai ; Söhngen, Yannick ; Solyst, William ; Song, Y. ; Srivastava, B. ; Stanislaus, T. D. Shirvel ; Stewart, David J. ; Stringfellow, Blair ; Suaide, Alexandre Alarcon do Passo ; Šumbera, Michal ; Sun, C. ; Sun, X. M. ; Sun, X. ; Sun, Y. ; Sun, Y. ; Surrow, Bernd ; Sweger, Zachary W. ; Szymański, Paweł ; Tang, Aihong ; Tang, Z. ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Todoroki, Takahito ; Tomkiel, C. A. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Tripathy, Srikanta Kumar ; Truhlar, Tomas ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Tsang, C. Y. ; Tu, Zhoudunming ; Ullrich, Thomas ; Underwood, David G. ; Upsal, Isaac ; Van Buren, Gene ; Vanek, Jan ; Vassiliev, Iouri ; Verkest, Veronica ; Videbæk, Flemming ; Voloshin, Sergei ; Wang, F. ; Wang, G. ; Wang, J. S. ; Wang, P. ; Wang, X. ; Wang, Y. ; Wang, Y. ; Wang, Z. ; Webb, Jason C. ; Weidenkaff, Philipp ; Westfall, Gary D. ; Wielanek, Daniel ; Wieman, Howard ; Wissink, Scott W. ; Witt, Richard ; Wu, J. ; Wu, J. ; Wu, Xiao ; Wu, Y. ; Xi, B. ; Xiao, Z. G. ; Xie, Guannan ; Xie, W. ; Xu, H. ; Xu, N. ; Xu, Q. H. ; Xu, Y. ; Xu, Z. ; Xu, Z. ; Yan, G. ; Yan, Z. ; Yang, C. ; Yang, Q. ; Yang, S. ; Yang, Y. ; Ye, Z. ; Ye, Z. ; Yi, L. ; Yip, K. ; Yu, Y. ; Zbroszczyk, Hanna Paulina ; Zha, Wangmei ; Zhang, C. ; Zhang, D. ; Zhang, J. ; Zhang, Shenghui ; Zhang, S. ; Zhang, Y. ; Zhang, Y. ; Zhang, Y. ; Zhang, Z. J. ; Zhang, Z. ; Zhang, Z. ; Zhao, F. ; Zhao, J. ; Zhao, M. ; Zhou, C. ; Zhou, J. ; Zhou, Y. ; Zhu, X. ; Żurek, Maria Katarzyna ; Zyzak, Maksym
Partons traversing the strongly interacting medium produced in heavy-ion collisions are expected to lose energy depending on their color charge and mass. We measure the nuclear modification factors for charm- and bottom-decay electrons, defined as the ratio of yields, scaled by the number of binary nucleon-nucleon collisions, in sNN−−−√ = 200 GeV Au+Au collisions to p+p collisions (RAA), or in central to peripheral Au+Au collisions (RCP). We find the bottom-decay electron RAA and RCP to be significantly higher than that of charm-decay electrons. Model calculations including mass-dependent parton energy loss in a strongly coupled medium are consistent with the measured data. These observations provide clear evidence of mass ordering of charm and bottom quark energy loss when traversing through the strongly coupled medium created in heavy-ion collisions.