Bose-Einstein correlations of pi(-)pi(-) pairs in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV

作者：Alt C^*; Anticic T; Baatar B; Barna D; Bartke J; Betev L; Bialkowska H; Blume C; Boimska B; Botje M; Bracinik J; Bramm R; Buncic P; Cerny V; Christakoglou P; Chung P; Chvala O; Cramer J G; Csato P; Dinkelaker P; Eckardt V; Flierl D; Fodor Z; Foka P; Friese V; Gal J; Gazdzicki M; Genchev V; Georgopoulos G; Gladysz E; Grebieszkow K; Hegyi S; Hoehne C; Kadija K; Karev A; Kikola D; Kliemant M; Kniege S; Kolesnikov V I

来源：Physical Review C, 2008, 77(6): 064908.

DOI：10.1103/PhysRevC.77.064908

Measurements of Bose-Einstein correlations of pi(-)pi(-) pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A,30A,40A,80A, and 158A GeV. Correlation functions were measured in the longitudinally comoving "out-side-long" reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse-momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse-momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed.

• 出版日期2008-6