Measurement of transverse single-spin asymmetries of π⁰ and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions

Jaroslav Adam, Leszek Adamczyk, Joseph R. Adams, J. Kevin Adkins, Geydar Agakishiev, Madan Mohan Aggarwal, Zubayer Ahammed, Igor G. Alekseev, Derek M. Anderson, Alexey Aparin, Elke Caroline Aschenauer, Muhammad Usman Ashraf, F. G. Atetalla, Anjali Attri, Georgy S. Averichev, Vipul Bairathi, Kenneth Barish, Arabinda Behera, Rene Bellwied, Anju Bhasin, Jaroslav Bielčík, Jana Bielčíková, Leslie C. Bland, Igor G. Bordyuzhin, James D. Brandenburg, Andrei V. Brandin, Joseph Butterworth, Helen Louise Caines, Manuel Calderón de la Barca Sánchez, Daniel A. Cebra, Irakli Chakaberia, Petr Chaloupka, B. K. Chan, F-H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, D. Chen, J. Chen, J. H. Chen, X. Chen, Z. Chen, J. Cheng, Michael Gerard Cherney, M. Chevalier, Subikash Choudhury, William Christie, Xiaoxuan Chu, Henry J. Crawford, Máté Csanád, M. Daugherity, T. G. Dedovich, Ingo Martin Deppner, Anatoly A. Derevschikov, Lidia Didenko, Christopher Dilks, X. Dong, James Lucus Drachenberg, James C. Dunlop, Terrence Edmonds, Nicholas Elsey, Jon M. Engelage, Geary Wareham Eppley, ShinIchi Esumi, Olga Y. Evdokimov, A. Ewigleben, Kjeld Oleg Eyser, Renee H. Fatemi, Salvatore Fazio, Pavol Federič, Jan Fedorišin, C. J. Feng, Yicheng Feng, Peter Filip, Evan Finch, Yuri V. Fisyak, Audrey Francisco, Łukasz Fulek, Carl A. Gagliardi, Tetyana Galatyuk, Frank Geurts, Navagyan Ghimire, Adam Gibson, Krishan Gopal, X. Gou, David P. Grosnick, Włodzimierz Guryn, A. I. Hamad, Ahmed M. Hamed, Szymon Harabasz, John W. Harris, S. He, W. He, Xionghong He, Y. He, S. Heppelmann, S. Heppelmann, Norbert Herrmann, E. Hoffman, Lukáš Holub, Y. Hong, S. Horvat, Y. Hu, Huan Zhong Huang, Shengli Huang, T. Huang, X. Huang, Thomas J. Humanic, P. Huo, George J. Igo, D. Isenhower, William W. Jacobs, Chitrasen Jena, Alexander Jentsch, Yuanjing Ji, Jiangyong Jia, K. Jiang, S. Jowzaee, Xin-Yue Ju, Eleanor G. Judd, Sonia Kabana, M. L. Kabir, Skipper Kagamaster, Dmitry Kalinkin, K. Kang, David Kapukchyan, Kolja Kauder, Hongwei Ke, Declan Keane, Armen Kechechyan, Matthew Kelsey, Yevheniia V. Khyzhniak, Daniel P. Kikoła, C. Kim, B. Kimelman, D. Kincses, Todd Adler Kinghorn, Ivan Kisel, A. Kiselev, Michal Kocan, L. M. Kočenda, Leszek Krzysztof Kosarzewski, L. Kramarik, Peter Kravtsov, Keith William Krueger, Nalinda Kulathunga Mudiyanselage, Lokesh Kumar, Shyam Kumar, Raghav Kunnawalkam Elayavalli, Joseph H. Kwasizur, Roy Alphanso Lacey, Shaowei Lan, Jeffery M. Landgraf, Jerome Lauret, Alexei Lebedev, Richard Lednicky, J. H. Lee, Yue Hang Leung, C. Li, C. Li, W. Li, W. Li, X. Li, Y. Li, Y. Liang, Robert Licenik, T. Lin, Y. Lin, Michael A. Lisa, F. Liu, H. Liu, P. Liu, P. Liu, Tong Liu, X. Liu, Y. Liu, Z. Liu, Tonko A. Ljubicic, William Joseph Llope, Ronald S. Longacre, N. S. Lukow, S. Luo, X. Luo, G. L. Ma, L. Ma, R. Ma, Yu-Gang Ma, Niseem Magdy Abdelwahab Abdelrahman, Richard Daniel Majka, Dukhishyam Mallick, Spyridon Margetis, Christina Markert, Howard S. Matis, Joel Anthony Mazer, Nikolai G. Minaev, Saskia Mioduszewski, Bedangadas Mohanty, Mriganka Mouli Mouli, Isaac A. Mooney, Zuzana Moravcova, Dmitry A. Morozov, M. Nagy, J. D. Nam, Md. Nasim, Kishora Nayak, D. Neff, John M. Nelson, Daniel B. Nemes, M. Nie, Grigory A. Nigmatkulov, Takafumi Niida, Larisa V. Nogach, Toshihiro Nonaka, A. S. Nunes, Grazyna Janina Odyniec, Akio Ogawa, Saehanseul Oh, Vitaly A. Okorokov, Brian S. Page, Robert Pak, Ashish Pandav, Yuri Panebratsev, Bogdan Pawlik, Diana Pawłowska, Hua Pei, Chris Perkins, Lawrence Pinsky, Roland Laszlo Pintér, Jan Marian Pluta, B. R. Pokhrel, Jeffrey Brent Porter, Matthew Posik, Navneet Kumar Pruthi, Mariusz Przybycien, Jörn H. Putschke, H. Qiu, Amilkar Quintero, Sooraj Krishnan Radhakrishnan, Suvarna Ramachandran, Robert L. Ray, Rosi Jan Reed, Hans Georg Ritter, Oleg V. Rogačevskij, Juan L. Romero, L. Ruan, Jan Rusnak, Nihar Ranjan Sahoo, H. Sako, Sevil Salur, Jack H. Sandweiss, Susumu Sato, William B. Schmidke, Norbert Schmitz, Benjamin R. Schweid, Florian Seck, Janet Elizabeth Seger, Maria Sergeeva, Richard Seto, Peter Seyboth, N. Shah, Ehtiram Shahaliev, Prashanth V. Shanmuganathan, M. Shao, Ashik Ikbal Sheikh, W. Q. Shen, Shusu Shi, Y. Shi, Q. Y. Shou, Ernst P. Sichtermann, Rafał Sikora, Miroslav Šimko, J. Singh, Subhash Singha, Nikolai Smirnov, William Solyst, Paul Richard Sorensen, Harold. M. Spinka, B. Srivastava, T. D. Shirvel Stanislaus, Maria Stefaniak, David J. Stewart, Michail Nikolaevič Strichanov, Blair Stringfellow, Alexandre Alarcon do Passo Suaide, Michal Šumbera, Branden Summa, X. M. Sun, X. Sun, Y. Sun, Y. Sun, Bernd Surrow, Dmitry N. Svirida, Paweł Szymański, Aihong Tang, Zebo Tang, Arkadiy Taranenko, Terence J. Tarnowsky, James H. Thomas, Anthony Robert Timmins, David Tlusty, Mikhail V. Tokarev, C. A. Tomkiel, Stephen Trentalange, Robert E. Tribble, Prithwish Tribedy, Srikanta Kumar Tripathy, Oleg D. Tsai, Zhoudunming Tu, Thomas Ullrich, David G. Underwood, Isaac Upsal, Gene Van Buren, Jan Vanek, Alexander Nikolaevich Vasiliev, Iouri Vassiliev, Flemming Videbæk, Stanislav Vokal, Sergei Voloshin, F. Wang, G. Wang, J. S. Wang, P. Wang, Y. Wang, Y. Wang, Z. Wang, Jason C. Webb, Philipp Weidenkaff, L. Wen, Gary D. Westfall, Howard Wieman, Scott W. Wissink, Richard Witt, Y. Wu, Z. G. Xiao, Guannan Xie, W. Xie, H. Xu, N. Xu, Qinghua Xu, Y. F. Xu, Y. Xu, Z. Xu, Z. Xu, C. Yang, Q. Yang, S. Yang, Y. Yang, Z. Yang, Z. Ye, Z. Ye, L. Yi, K. Yip, Y. Yu, Hanna Paulina Zbroszczyk, Wangmei Zha, C. Zhang, Dingwei Zhang, S. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Y. Zhang, Z. J. Zhang, Z. Zhang, Z. Zhang, J. Zhao, C. Zhong, C. Zhou, X. Zhu, Z. Zhu, Maria Katarzyna Żurek, Maksym Zyzak

  • 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.

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Author:Jaroslav AdamORCiDGND, Leszek AdamczykORCiDGND, Joseph R. AdamsORCiD, J. Kevin Adkins, Geydar AgakishievGND, Madan Mohan AggarwalGND, Zubayer AhammedORCiD, Igor G. AlekseevORCiD, Derek M. AndersonORCiD, Alexey AparinORCiD, Elke Caroline AschenauerORCiD, Muhammad Usman AshrafORCiD, F. G. Atetalla, Anjali Attri, Georgy S. AverichevGND, Vipul BairathiORCiD, Kenneth BarishORCiD, Arabinda BeheraORCiD, Rene BellwiedORCiDGND, Anju BhasinORCiD, Jaroslav BielčíkORCiDGND, Jana BielčíkováORCiDGND, Leslie C. BlandORCiD, Igor G. Bordyuzhin, James D. BrandenburgORCiD, Andrei V. Brandin, Joseph Butterworth, Helen Louise CainesORCiD, Manuel Calderón de la Barca SánchezORCiD, Daniel A. CebraORCiD, Irakli ChakaberiaORCiD, Petr ChaloupkaORCiD, B. K. Chan, F-H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, D. Chen, J. Chen, J. H. Chen, X. Chen, Z. Chen, J. Cheng, Michael Gerard Cherney, M. Chevalier, Subikash ChoudhuryORCiD, William ChristieORCiD, Xiaoxuan ChuORCiD, Henry J. CrawfordORCiD, Máté CsanádORCiD, M. Daugherity, T. G. Dedovich, Ingo Martin DeppnerORCiDGND, Anatoly A. Derevschikov, Lidia Didenko, Christopher DilksORCiD, X. Dong, James Lucus DrachenbergORCiD, James C. DunlopORCiD, Terrence Edmonds, Nicholas Elsey, Jon M. Engelage, Geary Wareham Eppley, ShinIchi EsumiORCiDGND, Olga Y. EvdokimovORCiD, A. Ewigleben, Kjeld Oleg EyserORCiD, Renee H. FatemiORCiD, Salvatore FazioORCiD, Pavol FederičORCiD, Jan FedorišinGND, C. J. Feng, Yicheng FengORCiD, Peter FilipORCiD, Evan FinchORCiD, Yuri V. FisyakORCiD, Audrey FranciscoORCiD, Łukasz FulekORCiD, Carl A. Gagliardi, Tetyana GalatyukORCiDGND, Frank GeurtsORCiD, Navagyan GhimireORCiD, Adam GibsonORCiD, Krishan GopalORCiD, X. Gou, David P. Grosnick, Włodzimierz GurynORCiD, A. I. Hamad, Ahmed M. HamedORCiD, Szymon HarabaszORCiDGND, John W. HarrisORCiDGND, S. He, W. He, Xionghong HeORCiD, Y. He, S. Heppelmann, S. Heppelmann, Norbert HerrmannGND, E. Hoffman, Lukáš HolubORCiD, Y. Hong, S. Horvat, Y. Hu, Huan Zhong HuangORCiD, Shengli Huang, T. Huang, X. Huang, Thomas J. HumanicORCiD, P. Huo, George J. Igo, D. Isenhower, William W. JacobsORCiD, Chitrasen JenaORCiD, Alexander JentschORCiD, Yuanjing JiORCiD, Jiangyong JiaORCiDGND, K. Jiang, S. Jowzaee, Xin-Yue JuGND, Eleanor G. JuddORCiD, Sonia KabanaORCiD, M. L. Kabir, Skipper KagamasterORCiD, Dmitry KalinkinORCiD, K. Kang, David KapukchyanORCiD, Kolja KauderORCiD, Hongwei KeORCiD, Declan KeaneORCiD, Armen Kechechyan, Matthew KelseyORCiD, Yevheniia V. KhyzhniakORCiD, Daniel P. KikołaORCiD, C. Kim, B. Kimelman, D. Kincses, Todd Adler Kinghorn, Ivan KiselORCiDGND, A. Kiselev, Michal KocanORCiD, L. M. KočendaGND, Leszek Krzysztof KosarzewskiORCiD, L. Kramarik, Peter KravtsovORCiD, Keith William Krueger, Nalinda Kulathunga MudiyanselageORCiD, Lokesh KumarORCiD, Shyam KumarORCiD, Raghav Kunnawalkam ElayavalliORCiD, Joseph H. Kwasizur, Roy Alphanso LaceyORCiD, Shaowei LanORCiD, Jeffery M. Landgraf, Jerome LauretORCiD, Alexei Lebedev, Richard LednickyORCiD, J. H. Lee, Yue Hang LeungORCiDGND, C. Li, C. Li, W. Li, W. Li, X. Li, Y. Li, Y. Liang, Robert LicenikORCiD, T. Lin, Y. Lin, Michael A. LisaORCiDGND, F. Liu, H. Liu, P. Liu, P. Liu, Tong Liu, X. Liu, Y. Liu, Z. Liu, Tonko A. Ljubicic, William Joseph LlopeORCiD, Ronald S. Longacre, N. S. Lukow, S. Luo, X. Luo, G. L. Ma, L. Ma, R. Ma, Yu-Gang MaORCiD, Niseem Magdy Abdelwahab AbdelrahmanORCiD, Richard Daniel MajkaORCiD, Dukhishyam MallickORCiD, Spyridon MargetisORCiD, Christina MarkertORCiDGND, Howard S. MatisORCiD, Joel Anthony Mazer, Nikolai G. Minaev, Saskia MioduszewskiORCiD, Bedangadas MohantyORCiD, Mriganka Mouli MouliORCiD, Isaac A. MooneyORCiD, Zuzana MoravcovaORCiD, Dmitry A. Morozov, M. Nagy, J. D. Nam, Md. Nasim, Kishora NayakORCiD, D. Neff, John M. Nelson, Daniel B. Nemes, M. Nie, Grigory A. NigmatkulovORCiD, Takafumi NiidaORCiD, Larisa V. Nogach, Toshihiro NonakaORCiD, A. S. Nunes, Grazyna Janina Odyniec, Akio Ogawa, Saehanseul OhORCiD, Vitaly A. OkorokovORCiD, Brian S. PageORCiD, Robert Pak, Ashish PandavORCiD, Yuri Panebratsev, Bogdan PawlikORCiD, Diana PawłowskaORCiD, Hua PeiORCiD, Chris Perkins, Lawrence PinskyORCiD, Roland Laszlo Pintér, Jan Marian Pluta, B. R. Pokhrel, Jeffrey Brent Porter, Matthew PosikORCiD, Navneet Kumar PruthiORCiD, Mariusz PrzybycienORCiD, Jörn H. PutschkeORCiDGND, H. Qiu, Amilkar QuinteroORCiD, Sooraj Krishnan Radhakrishnan, Suvarna RamachandranORCiD, Robert L. RayORCiD, Rosi Jan ReedORCiD, Hans Georg Ritter, Oleg V. RogačevskijGND, Juan L. Romero, L. Ruan, Jan RusnakORCiD, Nihar Ranjan SahooORCiD, H. Sako, Sevil SalurORCiDGND, Jack H. Sandweiss, Susumu Sato, William B. Schmidke, Norbert SchmitzGND, Benjamin R. Schweid, Florian SeckORCiDGND, Janet Elizabeth SegerORCiD, Maria Sergeeva, Richard SetoORCiDGND, Peter SeybothORCiDGND, N. Shah, Ehtiram Shahaliev, Prashanth V. ShanmuganathanORCiD, M. Shao, Ashik Ikbal SheikhORCiD, W. Q. Shen, Shusu ShiORCiD, Y. Shi, Q. Y. Shou, Ernst P. SichtermannORCiD, Rafał SikoraORCiD, Miroslav ŠimkoORCiD, J. Singh, Subhash SinghaORCiD, Nikolai SmirnovORCiD, William Solyst, Paul Richard SorensenORCiD, Harold. M. SpinkaORCiD, B. Srivastava, T. D. Shirvel Stanislaus, Maria StefaniakORCiD, David J. Stewart, Michail Nikolaevič StrichanovORCiDGND, Blair Stringfellow, Alexandre Alarcon do Passo SuaideORCiD, Michal ŠumberaORCiD, Branden Summa, X. M. Sun, X. Sun, Y. Sun, Y. Sun, Bernd SurrowORCiDGND, Dmitry N. SviridaORCiD, Paweł SzymańskiORCiD, Aihong TangORCiD, Zebo TangORCiD, Arkadiy TaranenkoORCiD, Terence J. TarnowskyORCiD, James H. ThomasORCiD, Anthony Robert TimminsORCiD, David Tlusty, Mikhail V. Tokarev, C. A. Tomkiel, Stephen TrentalangeORCiD, Robert E. Tribble, Prithwish TribedyORCiDGND, Srikanta Kumar TripathyORCiD, Oleg D. Tsai, Zhoudunming TuORCiD, Thomas UllrichORCiDGND, David G. UnderwoodORCiD, Isaac Upsal, Gene Van BurenORCiD, Jan VanekORCiD, Alexander Nikolaevich Vasiliev, Iouri VassilievORCiD, Flemming VidebækORCiD, Stanislav Vokal, Sergei VoloshinORCiDGND, F. Wang, G. Wang, J. S. Wang, P. Wang, Y. Wang, Y. Wang, Z. Wang, Jason C. WebbORCiD, Philipp WeidenkaffGND, L. Wen, Gary D. WestfallGND, Howard Wieman, Scott W. WissinkORCiD, Richard WittORCiD, Y. Wu, Z. G. Xiao, Guannan XieORCiD, W. Xie, H. Xu, N. Xu, Qinghua XuORCiD, Y. F. Xu, Y. Xu, Z. Xu, Z. Xu, C. Yang, Q. Yang, S. Yang, Y. Yang, Z. Yang, Z. Ye, Z. Ye, L. Yi, K. Yip, Y. Yu, Hanna Paulina ZbroszczykORCiD, Wangmei ZhaORCiD, C. Zhang, Dingwei ZhangORCiD, S. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Y. Zhang, Z. J. Zhang, Z. Zhang, Z. Zhang, J. Zhao, C. Zhong, C. Zhou, X. Zhu, Z. Zhu, Maria Katarzyna ŻurekORCiDGND, Maksym ZyzakGND
URN:urn:nbn:de:hebis:30:3-849413
DOI:https://doi.org/10.1103/PhysRevD.103.092009
ISSN:2470-0029
ISSN:2470-0010
ArXiv Id:http://arxiv.org/abs/2012.11428
Parent Title (English):Physical review. D, Particles, fields, gravitation, and cosmology
Publisher:American Physical Society
Place of publication:Ridge, NY
Document Type:Article
Language:English
Date of Publication (online):2021/05/27
Date of first Publication:2021/05/27
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Creating Corporation:STAR Collaboration
Release Date:2024/07/17
Volume:103
Issue:9, 092009
Article Number:092009
Page Number:14
Institutes:Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International