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

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.044904· OSTI ID:21286892

Anticic, T; Kadija, K; Nicolic, V; Susa, T ^[1]; Baatar, B; Kolesnikov, V I; Malakhov, A I; Melkumov, G L ^[2]; Barna, D; Csato, P; Fodor, Z; Gal, J; Hegyi, S; Laszlo, A; Levai, P; Molnar, J; Palla, G; Sikler, F; Szentpetery, I; Sziklai, J ^[3]

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1. Rudjer Boskovic Institute, Zagreb (Croatia)
2. Joint Institute for Nuclear Research, Dubna (Russian Federation)
3. KFKI Research Institute for Particle and Nuclear Physics, Budapest (Hungary)

Results are presented on event-by-event fluctuations of transverse momenta p{sub T} in central Pb+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{sub {pi}}*<2.6). Three fluctuation measures were studied: the distribution of average transverse momentum M(p{sub T}) in the event, the {phi}{sub p{sub T}} fluctuation measure, and two-particle transverse momentum correlations. Fluctuations of p{sub 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.

• OSTI ID: 21286892
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
CENTER-OF-MASS SYSTEM
CERN SPS SYNCHROTRON
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
DISTRIBUTION
ENERGY DEPENDENCE
FLUCTUATIONS
FORECASTING
FREEZING OUT
GEV RANGE
INTERACTIONS
LEAD
MULTIPLICITY
PARTICLE RAPIDITY
PROTONS
QUANTUM CHROMODYNAMICS
TRANSVERSE MOMENTUM