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ID: 544056.0, MPI für Physik / MPI für Physik
Energy dependence of transverse momentum fluctuations in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV
Authors:
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:79
Start Page:044904
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Results are presented on event-by-event fluctuations of transverse momenta $p_T$ in central Pb+Pb interactions at 20$A$, 30$A$, 40$A$, 80$A$, and 158$A$ GeV. The analysis was performed for charged particles at forward center-of-mass rapidity ($1.1 < y^{*}_{\pi} < 2.6$). Three fluctuation measures were studied: the distribution of average transverse momentum - $M(p_T)$ - in the event, the $\Phi_{p_{T}}$ fluctuation measure and two-particle transverse momentum correlations. Fluctuations of $p_T$ 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.
Classification / Thesaurus:NA49
Comment of the Author/Creator:Published in Phys. Rev. C
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:
Identifiers:
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