Extraction of thermal temperature and radial flow from single-particle spectra and two-particle HBT correlations at RHIC energy

• Published in: Journal of physics. G, Nuclear and particle physics Vol. 36; no. 5; pp. 055003 - 055003 (11)
• Main Authors: Shan, L Q, Wu, F J, Liu, J L, Feng, Q C, Tang, G X, Zhang, J B, Huo, L
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2009; Institute of Physics
• Subjects: Exact sciences and technology; Nuclear physics; Physics; The physics of elementary particles and fields; Kaons; Monte Carlo methods; Pions; Correlation energy; Flow velocity; Models; Observables; Mathematical physics; Nuclear physics
• ISSN: 0954-3899; 1361-6471
• DOI: 10.1088/0954-3899/36/5/055003

Within a hydro-inspired blast-wave model, we combine the single-particle mt spectra of pi- and transverse mass dependence of two-pion HBT radius Rs to extract the thermal freeze-out temperature T and the surface radial flow rapidity rho0 for six centrality classes in Au+Au collisions at GeV measured by the STAR Collaboration at the RHIC. The obtained T and rho0 are consistent with those of simultaneous fits of the single-particle mt spectra of pi+/-, K+/-, p and except for the peripheral collisions. The data can be well described by the blast-wave model, and the assumption that pi+/-, K+/-, p and freeze-out with the same thermal temperature and transverse flow profile is relatively good for central and mid-central collisions. Furthermore, we simulate the blast-wave emitting source by a Monte Carlo method and use the program CRAB to get the transverse mass dependence of the kaon HBT radius Rs. The 1sigma chi-square contours of mt spectrum and HBT radius Rs of kaon have a relatively wide overlap region in the T-rho0 plane, which leads to large errors when we combine both observables of kaon to extract its temperature and flow velocity.