Transport model study of the $m_T$-scaling for $Λ$, K, and $π$ HBT-correlations

Li, Qingfeng; Bleicher, Marcus; Stoecker, Horst

Transport model study of the $m_T$-scaling for $Λ$, K, and $π$ HBT-correlations

Authors

Li, Qingfeng

Bleicher, Marcus

Stoecker, Horst

Description

Based on the microscopic transport model UrQMD in which hadronic and string degrees of freedom are employed, the HBT parameters in the longitudinal co-moving system are investigated for charged pion and kaon, and $Λ$ sources in heavy ion collisions (HICs) at SPS and RHIC energies. In the Cascade mode, $R_O$ and the $R_L$ at high SPS and RHIC energies do not follow the $m_T$-scaling, however, after considering a soft equation of state with momentum dependence (SM-EoS) for formed baryons and a density-dependent Skyrme-like potential for ``pre-formed'' particles, the HBT radii of pions and kaons and even those of $Λ$s with large transverse momenta follow the $m_T$-scaling function $R=3/\sqrt{m_T}$ fairly well.
6 pages, 5 figs