Energy dependence of transverse momentum fluctuations in Pb[plus]Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV
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...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54239 https://orcid.org/0000-0001-8983-2169 |
| Summary: | 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. |
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