Energy dependence of transverse momentum fluctuations in Pb[plus]Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV
Author(s)Veres, Gabor; Roland, Christof E.; Roland, Gunther M.
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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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review C
American Physical Society
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.
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