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Article overview
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Charm quarks in medium and their contribution to di-electron spectra in relativistic heavy ion collisions | | Hao-jie Xu
; Xin Dong
; Li-juan Ruan
; Qun Wang
; Zhang-bu Xu
; Yi-fei Zhang
; | | Date: |
31 May 2013 | | Abstract: | We study the dynamics of charm quarks in the partonic medium and its
implication to the di-electron spectra in high energy heavy ion collisions. The
charm quarks traversing the thermal medium is simulated by the relativistic
Langevin equation for elastic scatterings of charm quarks by thermal partons in
a hydrodynamically expanding fireball. The transport coefficients of charm
quarks are calculated by the in-medium T-matrix method, where a static heavy
quark potential is used with parameters by fitting the lattice QCD results. The
di-electron invariant mass spectra are computed in the most central collisions
and are compared to the STAR preliminary data. The agreement is as good as the
previous results. The angular correlations of di-electrons are almost the same
in p+p and Au+Au collisions in the mass range 1.1<M<2.5 GeV with the
back-to-back feature, which means that the correlation is intact even with
medium interaction. Such a feature can be used to identify the di-electron
background of the open charm origin from thermal sources. | | Source: | arXiv, 1305.7302 | | Services: | Forum | Review | PDF | Favorites | |
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