Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

Qingfeng Li; Marcus Bleicher; Xianglei Zhu; Horst Stoecker

doi:10.1088/0954-3899/34/3/012

paper

Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

arXiv:nucl-th/0612030 · doi:10.1088/0954-3899/34/3/012

Abstract

Based on the UrQMD transport model, the transverse momentum and the rapidity dependence of the Hanbury-Brown-Twiss (HBT) radii $R_{L}$ , $R_{O}$ , $R_{S}$ as well as the cross term $R_{O L}$ at SPS energies are investigated and compared with the experimental NA49 and CERES data. The rapidity dependence of the $R_{L}$ , $R_{O}$ , $R_{S}$ is weak while the $R_{O L}$ is significantly increased at large rapidities and small transverse momenta. The HBT "life-time" issue (the phenomenon that the calculated $R_{O}^{2} - R_{S}^{2}$ value is larger than the correspondingly extracted experimental data) is also present at SPS energies.

17 pages, 11 figures