Energy dependence of transverse momentum fluctuations in Pb[plus]Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV

Anticic, T.; Baatar, B.; Barna, D.; Bartke, J.; Betev, L.; Białkowska, H.; Blume, C.; Boimska, B.; Botje, M.; Bracinik, J.; Bunčić, P.; Cerny, V.; Christakoglou, P.; Chung, P.; Chvala, O.; Cramer, J.; Csató, P.; Dinkelaker, P.; Eckardt, V.; Fodor, Z.; Foka, P.; Friese, V.; Gál, J.; Gaździcki, M.; Genchev, V.; Gładysz, E.; Grebieszkow, K.; Hegyi, S.; Höhne, C.; Kadija, K.; Karev, A.; Kikola, D.; Kolesnikov, V.; Kornas, E.; Korus, R.; Kowalski, M.; Kreps, M.; Laszlo, A.; Lacey, R.; van Leeuwen, M.; Lévai, P.; Litov, L.; Lungwitz, B.; Makariev, M.; Malakhov, A.; Mateev, M.; Melkumov, G.; Mischke, A.; Mitrovski, M.; Molnár, J.; Mrówczyński, St.; Nicolic, V.; Pálla, G.; Panagiotou, A.; Panayotov, D.; Petridis, A.; Peryt, W.; Pikna, M.; Pluta, J.; Prindle, D.; Pühlhofer, F.; Renfordt, R.; Roland, C.; Roland, G.; Rybczyński, M.; Rybicki, A.; Sandoval, A.; Schmitz, N.; Schuster, T.; Seyboth, P.; Siklér, F.; Sitar, B.; Skrzypczak, E.; Slodkowski, M.; Stefanek, G.; Stock, R.; Strabel, C.; Ströbele, H.; Susa, T.; Szentpétery, I.; Sziklai, J.; Szuba, M.; Szymanski, P.; Trubnikov, V.; Utvic, M.; Varga, D.; Vassiliou, M.; Veres, G.; Vesztergombi, G.; Vranić, D.; Włodarczyk, Z.; Wojtaszek, A.; Yoo, I.

Author(s)

Veres, Gabor; Roland, Christof E; Roland, Gunther M

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Alternative title

Energy dependence of transverse momentum fluctuations in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV

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Abstract

Results are presented on event-by-event fluctuations of transverse momenta pT in central Pb[plus]Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles at forward center-of-mass rapidity (1.1<y[subscript pi][superscript *]<2.6). Three fluctuation measures were studied: the distribution of average transverse momentum M(p[subscript T]) in the event, the Φp[subscript T] fluctuation measure, and two-particle transverse momentum correlations. Fluctuations of pT are small and show no significant energy dependence in the energy range of the CERN Super Proton Synchrotron. Results are compared with QCD-inspired predictions for the critical point, and with the UrQMD model. Transverse momentum fluctuations, similar to multiplicity fluctuations, do not show the increase expected for freeze-out near the critical point of QCD.

Date issued

2009-04

URI

http://hdl.handle.net/1721.1/54239

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review C

Publisher

American Physical Society

Citation

NA49 Collaboration et al. “Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from sNN=6.3 to 17.3 GeV.” Physical Review C 79.4 (2009): 044910. ©2009 The American Physical Society.

Version: Final published version

ISSN

0556-2813

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