Spectra and radial flow in relativistic heavy ion collisions with Tsallis statistics in a blast-wave description

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

DOI:https://doi.org/10.1103/PHYSREVC.79.051901· OSTI ID:21289886

Zebo, Tang; Yichun, Xu ^[1]; Lijuan, Ruan; Buren, Gene van; Zhangbu, Xu ^[2]; Fuqiang, Wang ^[3]

---

1. University of Science and Technology of China, Hefei 230026 (China)
2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Purdue University, West Lafayette, Indiana 47907 (United States)

We have implemented the Tsallis statistics in a Blast-Wave model (TBW) and applied it to midrapidity transverse-momentum spectra of identified particles measured at BNL Relativistic Heavy Ion Collider (RHIC). This new TBW function fits the RHIC data very well for p{sub T}<3 GeV/c. We observed that the collective flow velocity starts from zero in p+p and peripheral Au+Au collisions and grows to 0.470{+-}0.009c in central Au+Au collisions. The resulting (q-1) parameter, which characterizes the degree of nonequilibrium in a system, indicates an evolution from a highly nonequilibrated system in p+p collisions toward an almost thermalized system in central Au+Au collisions. The temperature and collective velocity are well described by a quadratic dependence on (q-1). Two sets of parameters in our TBW are required to describe the meson and baryon groups separately in p+p collisions while one set appears to fit all spectra in central Au+Au collisions.

• OSTI ID: 21289886
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 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
BARYONS
BNL
BROOKHAVEN RHIC
COLLISIONS
EXPLOSIONS
GEV RANGE
GOLD
HEAVY ION REACTIONS
MESONS
RELATIVISTIC RANGE
SPECTRA
TRANSVERSE MOMENTUM
VELOCITY