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Odyniec, Grazyna Janina ; Afanasiev, Sergey V. ; Alber, Thomas ; Appelshäuser, Harald ; Bächler, Joachim ; Bailey, Stephen John ; Barnby, Lee Stuart ; Bartke, Jerzy ; Białkowska, Helena ; Blyth, Charles O. ; Bock, Rudolf ; Bormann, Christian ; Brady, Franklin Paul ; Brockmann, Robert ; Buncic, Nenad ; Bunčić, Predrag ; Caines, Helen Louise ; Cebra, Daniel A. ; Chan, P. ; Cooper, Glenn E. ; Cramer, John G. ; Cramer, Pauline B. ; Csató, Péter ; Dietz, Oliver ; Dunn, Jason ; Eckardt, Volker ; Eckhardt, Frank ; Ferguson, M. I. ; Fischer, Hans Gerhard ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Fuchs, M. ; Gabler, Frank ; Gál, József ; Gaździcki, Marek ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Jaroslaw ; Günther, Jörg ; Harris, John W. ; Hegyi, Sándor ; Henkel, Torsten ; Hill, L. A. ; Huang, Isaac ; Howe, Mark A. ; Hümmler, Holm Gero ; Igo, George J. ; Irmscher, Detlef ; Jacobs, Peter Martin ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Konashenok, Anton ; Kowalski, Marek ; Lasiuk, Brian ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Melkumov, Georgy L. ; Mock, Andreas ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Porter, R. Jefferson ; Poskanzer, Arthur M. ; Poziombka, Stefan ; Prindle, Duncan J. ; Pühlhofer, Falk ; Rauch, Wolfgang Hans ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Ritter, Hans Georg ; Röhrich, Dieter ; Roland, Christof ; Roland, Gunther ; Rudolph, Heinrich ; Rybicki, Andrzej ; Sakrejda, Iwona ; Sandoval, Andres ; Sann, Hans ; Semenov, Alexei Yu. ; Schäfer, Erich ; Schmischke, Dirk ; Schmitz, Norbert ; Schönfelder, Stefan ; Seyboth, Peter ; Seyerlein, Jürgen ; Siklér, Ferenc ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Szentpétery, Imre ; Sziklai, János ; Toy, Milton Y. ; Trainor, Thomas A. ; Trentalange, Stephen ; Ullrich, Thomas ; Vassiliou, Maria ; Vesztergombi, György ; Vranić, Danilo ; Wang, Feipeng ; Weerasundara, Dhammika D. ; Wenig, Siegfried ; Whitten, Charles A. ; Wienold, Thomas ; Wood, Lindsay ; Yates, Tim A. ; Zimányi, József ; Zhu, Xue-Zhou ; Zybert, Ryszard
Using the NA49 main TPC, the central production of hyperons has been measured in CERN SPS Pb - Pb collisions at 158 GeV c-1. The preliminary ratio, studied at 2.0 < y < 2.6 and 1 < pT < 3 GeV c-1, equals ~ (13 ± 4)% (systematic error only). It is compatible, within errors, with the previously obtained ratios for central S + S [1], S + W [2], and S + Au [3] collisions. The fit to the transverse momentum distribution resulted in an inverse slope parameter T of 297 MeV. At this level of statistics we do not see any noticeable enhancement of hyperon production with the increased volume (and, possibly, degree of equilibration) of the system from S + S to Pb + Pb. This result is unexpected and counterintuitive, and should be further investigated. If confirmed, it will have a significant impact on our understanding of mechanisms leading to the enhanced strangeness production in heavy-ion collisions.
Mischke, André ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wenig, Siegfried ; Wetzler, Alexander Albert ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV.
Mischke, André ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wenig, Siegfried ; Wetzler, Alexander Albert ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Rapidity distributions for Lambda and anti-Lambda hyperons in central Pb-Pb collisions at 40, 80 and 158 AGeV and for K 0 s mesons at 158 AGeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the Lambda/pi and anti-Lambda/pi is observed. The anti-Lambda/Lambda ratio shows a steep increase with collision energy. Evidence for a anti-Lambda/anti-p ratio greater than 1 is found at 40 AGeV.
Magdy Abdelwahab Abdelrahman, Niseem ; Adamczyk, Leszek ; Adkins, J. Kevin ; Agakishiev, Geydar ; Aggarwal, Madan Mohan ; Ahammed, Zubayer ; Alekseev, Igor G. ; Alford, J. ; Anson, Christopher Daniel ; Aparin, Alexey ; Arkhipkin, Dmitry A. ; Aschenauer, Elke Caroline ; Averichev, Georgy S. ; Banerjee, A. ; Beavis, Dana Richard ; Bellwied, Rene ; Bhasin, Anju ; Bhati, Ashok Kumar ; Bhattarai, P. ; Bielčík, Jaroslav ; Bielčíková, Jana ; Bland, Leslie C. ; Bordyuzhin, Igor G. ; Borowski, W. ; Bouchet, Jonathan ; Brandin, Andrei V. ; Brovko, Samantha G. ; Bültmann, Stephen L. ; Bunzarov, Ivan ; Burton, T.P. ; Butterworth, Joseph ; Caines, Helen Louise ; Calderón de la Barca Sánchez, Manuel ; Campbell, J.M. ; Cebra, Daniel A. ; Cendejas, R. ; Cervantes, M.C. ; Chaloupka, Petr ; Chang, Z. ; Chattopadhyay, S. ; Chen, H.F. ; Chen, J.H. ; Chen, L. ; Cheng, J. ; Cherney, Michael Gerard ; Chikanian, Alexei ; Christie, William ; Codrington, M.J.M. ; Contin, Giacomo ; Cramer, John G. ; Crawford, Henry J. ; Cui, X. ; Das, Supriya ; Davila Leyva, A. ; De Silva, L.C. ; Debbe, R.R. ; Dedovič, Tatiana G. ; Deng, J. ; Derevschikov, Anatoly A. ; Souza, Rafael Derradi de ; di Ruzza, Benedetto ; Didenko, Lidia ; Dilks, Christopher ; Ding, F. ; Djawotho, P. ; Dong, X. ; Drachenberg, James Lucus ; Draper, James E. ; Du, C.M. ; Dunkelberger, Lloyd Edward ; Dunlop, James C. ; Efimov, Leonid G. ; Engelage, Jon M. ; Engle, K.S. ; Eppley, Geary Wareham ; Eun, L. ; Evdokimov, Olga Y. ; Eyser, Kjeld Oleg ; Fatemi, Renee H. ; Fazio, Salvatore ; Fedorišin, Jan ; Filip, Peter ; Fisyak, Yuri V. ; Flores, C.E. ; Gagliardi, Carl A. ; Gangadharan, Dhevan Raja ; Garand, David ; Geurts, Frank ; Gibson, Adam ; Girard, M. ; Gliske, S. ; Greiner, Leo Clifford ; Grosnick, David P. ; Gunarathne, D.S. ; Guo, Y. ; Gupta, Anik ; Gupta, S. ; Guryn, Włodzimierz ; Haag, B. ; Hamed, Ahmed M. ; Han, L-X. ; Haque, R. ; Harris, John W. ; Heppelmann, Steven Francis ; Hirsch, Andrew S. ; Hoffmann, Gerald W. ; Hofman, D.J. ; Horvat, S. ; Huang, B. ; Huang, H.Z. ; Huang, X. ; Huck, Patrick ; Humanic, Thomas J. ; Igo, George J. ; Jacobs, William W. ; Jang, H. ; Judd, Eleanor G. ; Kabana, Sonia ; Kalinkin, Dmitry ; Kang, K. ; Kauder, Kolja ; Ke, Hongwei ; Keane, Declan ; Kechechyan, Armen ; Kesich, A. ; Khan, Z.H. ; Kikola, D.P. ; Kisel, Ivan ; Kisiel, Adam Ryszard ; Koetke, Donald D. ; Kollegger, Thorsten ; Konzer, J. ; Koralt, I. ; Kosarzewski, Leszek Krzysztof ; Kotchenda, L. ; Kraishan, A.F. ; Kravtsov, Peter ; Krueger, Keith William ; Kulakov, Igor ; Kumar, Lokesh ; Kycia, R.A. ; Lamont, Matthew A. C. ; Landgraf, Jeffery M. ; Landry, K.D. ; Lauret, Jerome ; Lebedev, Alexei ; Lednicky, Richard ; Lee, J.H. ; Li, C. ; Li, W. ; Li, Xiaomei ; Li, Xiaomei ; Li, Y. ; Li, Z.M. ; Lisa, Michael A. ; Liu, F. ; Ljubicic, Tonko A. ; Llope, William Joseph ; Lomnitz, Michael ; Longacre, Ronald S. ; Luo, X. ; Ma, G.L. ; Ma, Yu-Gang ; Mahapatra, D.P. ; Majka, Richard Daniel ; Margetis, Spyridon ; Markert, Christina ; Masui, H. ; Matis, Howard S. ; McDonald, Daniel ; McShane, Tom S. ; Minaev, Nikolai G. ; Mioduszewski, Saskia ; Mohanty, Bedangadas ; Mondal, Mriganka Mouli ; Morozov, Dmitry A. ; Mustafa, M.K. ; Nandi, Basanta Kumar ; Nasim, Md. ; Nayak, Tapan Kumar ; Nelson, John M. ; Nigmatkulov, Grigory A. ; Nogach, Larisa V. ; Noh, S.Y. ; Novak, J. ; Nurušev, Sandibek B. ; Odyniec, Grazyna Janina ; Ogawa, Akio ; Oh, Kunsu ; Ohlson, Alice ; Okorokov, Vitaly A. ; Oldag, E.W. ; Olvitt, D.L. ; Page, Brian S. ; Pan, Y.X. ; Pandit, Y. ; Panebratsev, Yuri ; Pawlak, Tomasz Jan ; Pawlik, Bogdan ; Pei, Hua ; Perkins, Chris ; Pile, P. ; Planinic, Mirko ; Pluta, Jan Marian ; Poljak, Nikola ; Poniatowska, K. ; Porter, Jeffrey Brent ; Poskanzer, Arthur M. ; Pruthi, Navneet Kumar ; Przybycien, Mariusz ; Putschke, Jörn H. ; Qiu, H. ; Quintero, Amilkar ; Ramachandran, Suvarna ; Raniwala, Rashmi ; Raniwala, Sudhir ; Ray, Robert L. ; Riley, C.K. ; Ritter, Hans Georg ; Roberts, Jabus B. ; Rogačevskij, Oleg V. ; Romero, Juan L. ; Ross, J.F. ; Roy, Ankhi ; Ruan, Lijuan ; Rusnak, Jan ; Rusnakova, Olga ; Sahoo, Nihar Ranjan ; Sahu, Pradip Kumar ; Sakrejda, Iwona ; Salur, Sevil ; Sandacz, Andrzej ; Sandweiss, Jack H. ; Sangaline, Evan ; Sarkar, Amal ; Schambach, Joachim ; Scharenberg, Rolf Paul ; Schmah, Alexander ; Schmidke, William B. ; Schmitz, Norbert ; Seger, Janet Elizabeth ; Seyboth, Peter ; Shah, N. ; Shahaliev, Ehtiram ; Shanmuganathan, Prashanth V. ; Shao, M. ; Sharma, B. ; Shen, W.Q. ; Shi, S.S. ; Shou, Q.Y. ; Sichtermann, Ernst P. ; Šimko, Miroslav ; Skoby, M.J. ; Smirnov, Dmitri V. ; Smirnov, Nikolai ; Solanki, D. ; Sorensen, Paul Richard ; Spinka, Harold. M. ; Srivastava, Brijesh Kumar ; Stanislaus, T. D. Shirvel ; Stevens, J.R. ; Stock, Reinhard ; Strichanov, Michail Nikolaevič ; Stringfellow, Blair ; Šumbera, Michal ; Sun, X. ; Sun, X.M. ; Sun, Y. ; Sun, Z. ; Surrow, Bernd ; Svirida, Dmitry N. ; Symons, Timothy James MacNeil ; Szelezniak, M.A. ; Takahashi, Jun ; Tang, Aihong ; Tang, Zebo ; Tarnowsky, Terence J. ; Thomas, James H. ; Timmins, Anthony Robert ; Tlusty, David ; Tokarev, Mikhail V. ; Trentalange, Stephen ; Tribble, Robert E. ; Tribedy, Prithwish ; Trzeciak, Barbara Antonina ; Tsai, Oleg D. ; Turnau, J. ; Ullrich, Thomas ; Underwood, David G. ; Van Buren, Gene ; Nieuwenhuizen, Gerrit J. van ; Vandenbroucke, Maxence ; Vanfossen, Joseph A. ; Varma, Raghava ; Vasconcelos, Geraldo M. S. ; Vasiliev, Alexander Nikolaevich ; Vértesi, Róbert ; Videbæk, Flemming ; Viyogi, Yogendra P. ; Vokal, Stanislav ; Vossen, A. ; Wada, M. ; Wang, F. ; Wang, G. ; Wang, H. ; Wang, J.S. ; Wang, X.L. ; Wang, Y. ; Wang, Y. ; Webb, Grant ; Webb, Jason C. ; Westfall, Gary D. ; Wieman, Howard ; Wissink, Scott W. ; Wu, Y.F. ; Xiao, Z. ; Xie, W. ; Xin, K. ; Xu, H. ; Xu, J. ; Xu, N. ; Xu, Q.H. ; Xu, Y. ; Xu, Z. ; Yan, W. ; Yang, C. ; Yang, Y. ; Yang, Y. ; Ye, Z. ; Yepes, Pablo P. ; Yi, L. ; Yip, K. ; Yoo, In-Kwon ; Yu, N. ; Zbroszczyk, Hanna Paulina ; Zha, W. ; Zhang, J.B. ; Zhang, J.L. ; Zhang, S. ; Zhang, X.P. ; Zhang, Y. ; Zhang, Z.P. ; Zhao, F. ; Zhao, J. ; Zhong, C. ; Zhu, X. ; Zhu, Y.H. ; Zoulkarneeva, Youlia ; Zyzak, Maksym
A data-driven method was applied to Au+Au collisions at √sNN = 200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance η-dependent and η-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a η-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of η within the measured range of pseudorapidity |η| < 1. In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be 34%±2%(stat.)±3%(sys.) for particles with transverse momentum pT less than 2 GeV/c. The η-dependent part, attributed to nonflow correlations, is found to be 5% ± 2%(sys.) relative to the flow of the measured second harmonic cumulant at |η| > 0.7.
Fisyak, Yuri V. ; Ivanov, Victor ; Ke, Hongwei ; Kisel, Ivan ; Kisel, Pavel ; Kozlov, Grigory ; Margetis, Spyridon ; Tang, Aihong ; Vassiliev, Iouri ; Zyzak, Maksym
The search for short-lived particles is usually the final stage in the chain of event reconstruction and precedes event selection when operating in online mode or physics analysis when operating in offline mode. Most often such short-lived particles are neutral and their search and reconstruction is carried out using their daughter charged particles resulting from their decay.
The use of the missing mass method makes it possible to find and analyze also decays of charged short-lived particles, when one of the daughter particles is neutral and is not registered in the detector system. One of the most known examples of such decays is the decay Σ− → nπ−.
In this paper, we discuss in detail the missing mass method, which was implemented as part of the KF Particle Finder package for the search and analysis of short-lived particles, and describe the use of the method in the STAR experiment (BNL, USA).
The method was used to search for pion (π± → μ±ν) and kaon (K± → μ±ν and K± → π±π0) decays online on the HLT farm in the express production chain. An important feature of the express production chain in the STAR experiment is that it allows one to start calibration, production, and analysis of the data immediately after receiving them.
Here, the particular features and results of the real-time application of the method within the express processing of data obtained in the BES-II program at a beam energy of 3.85 GeV/n when working with a fixed target are presented and discussed.
Bächler, Joachim ; Bartke, Jerzy ; Białkowska, Helena ; Bock, Rudolf ; Brockmann, Robert ; Bunčić, Predrag ; Chase, S. I. ; Derado, Ivan ; Eckardt, Volker ; Eschke, Jürgen ; Ferenc, Daniel ; Fleischmann, B. ; Foka, Panagiota ; Fuchs, Michael ; Gaździcki, Marek ; Gładysz-Dziaduś, Ewa ; Harris, John W. ; Heck, Wilfried ; Hoffmann, Matthias ; Jacobs, Peter Martin ; Kabana, Sonia ; Kadija, Krešo ; Keidel, Ralf ; Kosiec, Jacek ; Kowalski, Marek ; Kühmichel, Andreas ; Lahanas, Michael ; Lee, Jae-Yun ; Ljubičić, Ante ; Margetis, Spyridon ; Morse, Richard J. ; Nappi, Eugenio ; Odyniec, Grazyna Janina ; Paic, Guy ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Posa, Francesco ; Poskanzer, Arthur M. ; Pugh, Howel G. ; Pühlhofer, Falk ; Rai, Gulshan ; Rauch, Wolfgang Hans ; Renfordt, Rainer Arno Ernst ; Röhrich, Dieter ; Roland, Gunther ; Rothard, Hermann ; Runge, Kay ; Sandoval, Andres ; Schambach, Joachim ; Schmitz, Norbert ; Schmoetten, Emile ; Schneider, Ingo ; Seyboth, Peter ; Seyerlein, Jürgen ; Skrzypczak, Ewa ; Stefański, Piotr ; Stock, Reinhard ; Ströbele, Herbert ; Teitelbaum, Lawrence Paul ; Tincknell, Mark L. ; Tonse, Shaheen ; Vasileiadis, Georgios ; Vesztergombi, György ; Vranić, Danilo ; Wenig, Siegfried
The transverse momentum and rapidity distributions of negative hadrons and participant protons have been measured for central 32S+ 32S collisions at plab=200 GeV/c per nucleon. The proton mean rapidity shift < Delta y>~1.6 and mean transverse momentum <pT>~0.6 GeV/c are much higher than in pp or peripheral AA collisions and indicate an increase in the nuclear stopping power. All pT spectra exhibit similar source temperatures. Including previous results for K0s Lambda , and Lambda -bar, we account for all important contributions to particle production.
Blume, Christoph ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lednický, Richard ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Smolik, Jan ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wenig, Siegfried ; Wetzler, Alexander Albert ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
The large acceptance and high momentum resolution as well as the significant particle identification capabilities of the NA49 experiment at the CERN SPS allow for a broad study of fluctuations and correlations in hadronic interactions. In the first part recent results on event-by-event charge and p_t fluctuations are presented. Charge fluctuations in central Pb+Pb reactions are investigated at three different beam energies (40, 80, and 158 AGeV), while for the p_t fluctuations the focus is put on the system size dependence at 158 AGeV. In the second part recent results on Bose Einstein correlations of h-h- pairs in minimum bias Pb+Pb reactions at 40 and 158 AGeV, as well as of K+K+ and K-K- pairs in central Pb+Pb collisions at 158 AGeV are shown. Additionally, other types of two particle correlations, namely pi p, Lambda p, and Lambda Lambda correlations, have been measured by the NA49 experiment. Finally, results on the energy and system size dependence of deuteron coalescence are discussed.
Appelshäuser, Harald ; Bächler, Joachim ; Bailey, Stephen John ; Barnby, Lee Stuart ; Bartke, Jerzy ; Barton, Robert Allan ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Bock, Rudolf ; Bormann, Christian ; Brady, Franklin Paul ; Brockmann, Robert ; Brun, René ; Bunčić, Predrag ; Caines, Helen Louise ; Cebra, Daniel A. ; Cooper, Glenn E. ; Cramer, John G. ; Csato, Peter ; Dunn, Jason ; Eckardt, Volker ; Eckhardt, Frank ; Ferguson, M. I. ; Fischer, Hans Gerhard ; Flierl, Dominik Bernhard ; Fodor, Zoltan ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Fuchs, Matthias ; Gabler, Frank ; Gal, Jozsef ; Gaździcki, Marek ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Jaroslaw ; Günther, Jörg ; Harris, John W. ; Hegyi, Sandor ; Henkel, Torsten ; Hill, L. A. ; Huang, Isaac ; Hümmler, Holm Gero ; Igo, George J. ; Irmscher, Detlef ; Jacobs, Peter Martin ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Kowalski, Marek ; Lasiuk, Brian ; Lévai, Peter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Melkumov, Georgy L. ; Mock, Andreas ; Molnár, József ; Nelson, John M. ; Oldenburg, Markus D. ; Odyniec, Grazyna Janina ; Palla, Gabriella ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Porter, R. Jefferson ; Poskanzer, Arthur M. ; Poziombka, Stefan ; Prindle, Duncan J. ; Pühlhofer, Falk ; Rauch, Wolfgang Hans ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Ritter, Hans Georg ; Röhrich, Dieter ; Roland, Christof ; Roland, Gunther ; Rudolph, Heinrich ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Semenov, Alexei Yu. ; Schäfer, Erich ; Schmischke, Dirk ; Schmitz, Norbert ; Schönfelder, Stefan ; Seyboth, Peter ; Seyerlein, Jürgen ; Sikler, Ferenc ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Szentpetery, Imre ; Sziklay, Janos ; Toy, Milton Y. ; Trainor, Thomas A. ; Trentalage, Stephen ; Ullrich, Thomas ; Vassiliou, Maria ; Vesztergombi, György ; Voloshin, Sergei ; Vranić, Danilo ; Wang, Feipeng ; Weerasundara, Dhammika D. ; Wenig, Siegfried ; Whitten, Charles A. ; Wienold, Thomas ; Wood, Lindsay ; Yates, Tim A. ; Xu, Nu ; Zimanyi, Jozsef ; Zhu, Xue-Zhou ; Zybert, Ryszard
Two-particle correlation functions of negative hadrons over wide phase space, and transverse mass spectra of negative hadrons and deuterons near mid-rapidity have been measured in central Pb+Pb collisions at 158 GeV per nucleon by the NA49 experiment at the CERN SPS. A novel Coulomb correction procedure for the negative two-particle correlations is employed making use of the measured oppositely charged particle correlation. Within an expanding source scenario these results are used to extract the dynamic characteristics of the hadronic source, resolving the ambiguities between the temperature and transverse expansion velocity of the source, that are unavoidable when single and two particle spectra are analysed separately. The source shape, the total duration of the source expansion, the duration of particle emission, the freeze-out temperature and the longitudinal and transverse expansion velocities are deduced.
Alber, Thomas ; Bächler, Joachim ; Bartke, Jerzy ; Białkowska, Helena ; Bloomer, Matthew A. ; Bock, Rudolf ; Braithwaite, Wilfred J. ; Brinkmann, Dittmar ; Brockmann, Robert ; Bunčić, Predrag ; Chan, Phaikying ; Cramer, Pauline B. ; Cramer, John G. ; Derado, Ivan ; Eckardt, Volker ; Eschke, Jürgen ; Favuzzi, Cecilia ; Ferenc, Daniel ; Fleischmann, B. ; Foka, Panagiota ; Freund, Peter ; Fuchs, Michael ; Gaździcki, Marek ; Gładysz-Dziaduś, Ewa ; Harris, John W. ; Hoffman, Matthias ; Jacobs, Peter Martin ; Kabana, Sonia ; Kadija, Krešo ; Kosiec, Jacek ; Kowalski, Marek ; Kühmichel, Andreas ; Lahanas, Michael ; Lee, Jae-Yun ; Ljubičić, Ante ; Margetis, Spyridon ; Mitchell, Jeffery Thomas ; Morse, Richard J. ; Nappi, Eugenio ; Odyniec, Grazyna Janina ; Paić, Guy ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Posa, Francesco ; Poskanzer, Arthur M. ; Pühlhofer, Falk ; Rauch, Wolfgang Hans ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Röhrich, Dieter ; Roland, Gunther ; Rothard, Hermann ; Runge, Kay ; Sandoval, Andres ; Schambach, Joachim ; Schmitz, Norbert ; Schmoetten, Emile ; Schneider, Ingo ; Seyboth, Peter ; Seyerlein, Jürgen ; Skrzypczak, Ewa ; Spinelli, Paolo ; Stefansky, Piotr ; Stock, Reinhard ; Ströbele, Herbert ; Trainor, Thomas A. ; Vasileiadis, Georgios ; Vassiliou, Maria ; Vranić, Danilo ; Wenig, Siegfried ; Wosiek, Barbara
The NA35 experiment has collected a high statistics set of momentum analyzed negative hadrons near and forward of midrapidity for central collisions of 200A GeV/c 32S+S, Cu, Ag, and Au. Using momentum space correlations to study the size of the source of particle production, the transverse source radii are found to decrease by ~40% at midrapidity and ~20% at forward rapidity while the longitudinal radius RL is found to decrease by ~50% as pT increases over the interval 50<pT<600 MeV/c. Calculations using a microscopic phase space approach (relativistic quantum molecular dynamics) reproduce the observed trends of the data. PACS: 25.75.+r
Alber, Thomas ; Bartke, Jerzy ; Białkowska, Helena ; Bloomer, Matthew A. ; Bock, Rudolf ; Braithwaite, Wilfred J. ; Brinkmann, Dittmar ; Brockmann, Robert ; Bunčić, Predrag ; Chan, Phaikying ; Chase, S. I. ; Cramer, Pauline B. ; Cramer, John G. ; Derado, Ivan ; Eberlein, Björn ; Eckardt, Volker ; Eschke, Jürgen ; Ferenc, Daniel ; Fleischmann, B. ; Foka, Panagiota ; Freund, Peter ; Fuchs, Michael ; Gładysz-Dziaduś, Ewa ; Harris, John W. ; Hoffmann, Matthias ; Jacobs, Peter Martin ; Kabana, Sonia ; Kadija, Krešo ; Kosiec, Jacek ; Kowalski, Marek ; Lahanas, Michael ; Lee, Jae-Yun ; Ljubicic, Ante Jr. ; Margetis, Spyridon ; Mitchell, Jeffery Thomas ; Morse, Richard J. ; Nappi, Eugenio ; Odyniec, Grazyna Janina ; Paic, Guy ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Posa, Francesco ; Poskanzer, Arthur M. ; Pugh, Howel G. ; Rai, Gulshan ; Rauch, Wolfgang Hans ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Gunther ; Rothard, Hermann ; Runge, Kay ; Sandoval, Andres ; Schambach, Joachim ; Schmitz, Norbert ; Schmoetten, Emile ; Schneider, Ingo ; Sendelbach, Ralf ; Seyboth, Peter ; Seyerlein, Jürgen ; Skrzypczak, Ewa ; Stefansky, Piotr ; Teitelbaum, Lawrence Paul ; Tonse, Shaheen ; Trainor, Thomas A. ; Vasileiadis, Georgios ; Vassiliou, Maria ; Wenig, Siegfried ; Wensveen, Martinus ; Wosiek, Barbara
We present the measured correlation functions for pi+ pi-, pi- pi- and pi+ pi+ pairs in central S+Ag collisions at 200 GeV per nucleon. The Gamov function, which has been traditionally used to correct the correlation functions of charged pions for the Coulomb interaction, is found to be inconsistent with all measured correlation functions. Certain problems which have been dominating the systematic uncertainty of the correlation analysis are related to this inconsistency. It is demonstrated that a new Coulomb correction method, based exclusively on the measured correlation function for pi+ pi- pairs, may solve the problem.