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

Qingfeng Li 1∗ , Marcus Bleicher , Xianglei Zhu , and Horst Stöcker 1,2 1) Frankfurt Institute for Advanced Studies (FIAS), Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany 2) Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany 3) Physics Department, Tsinghua University, Beijing 100084, P.R. China Abstract Based on the UrQMD transport model, the transverse momentum and the rapidity dependence of the Hanbury-Brown-Twiss (HBT) radii RL, RO, RS as well as the cross term ROL at SPS energies are investigated and compared with the experimental NA49 and CERES data. The rapidity dependence of the RL, RO, RS is weak while the ROL is significantly increased at large rapidities and small transverse momenta. The HBT “life-time” issue (the phenomenon that the calculated