Energy dependence of transverse momentum fluctuations in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV
- Rudjer Boskovic Institute, Zagreb (Croatia)
- Joint Institute for Nuclear Research, Dubna (Russian Federation)
- 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, Vol. 79, Issue 4; Other Information: DOI: 10.1103/PhysRevC.79.044904; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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