One-, two-, and three-particle distributions from 158A GeV/c central Pb+Pb collisions

0185727 - UJF-V 20033026 RIV US eng J - Článek v odborném periodiku
Aggarwal, M. M. - Angelis, A. L. S. - Antonenko, V. - Hřivnáčová, Ivana - Kugler, Andrej - Petráček, Vojtěch - Šumbera, Michal
One-, two-, and three-particle distributions from 158A GeV/c central Pb+Pb collisions.
Physical Review. C. Roč. 67, č. 1 (2003), s. 014906. ISSN 0556-2813
Grant CEP: GA AV ČR KSK1048102
Klíčová slova: pion interferometry * heavy-ion collisions
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 2.708, rok: 2003

Several hadronic observables have been studied in central 158A GeV Pb+Pb collisions using data measured by the WA98 experiment at CERN: single pi(-) and K- production, as well as two- and three-pion interferometry. The Wiedemann-Heinz hydrodynamical model has been fitted to the pion spectrum, giving an estimate of the temperature and transverse flow velocity. Bose-Einstein correlations between two identified pi(-) have been analyzed as a function of k(T), using two different parametrizations. The results indicate that the source does not have a strictly boost invariant expansion or spend time in a long-lived intermediate phase. A comparison between data and a hydrodynamical based simulation shows very good agreement for the radii parameters as a function of k(T). The pion phase-space density at freeze-out has been measured, and agrees well with the Tomasik-Heinz model. A large pion chemical potential close to the condensation limit of m(pi) seems to be excluded. The three-pion Bose-Einstein interferometry shows a substantial contribution of the genuine three-pion correlation, but not quite as large as expected for a fully chaotic and symmetric source.
Trvalý link: http://hdl.handle.net/11104/0082110