Di-lepton production in heavy-ion collisions and the QCD phase diagram

Yifei Zhang 1 , Haojie Xu 1 , Wangmei Zha 1 ,  and Qun Wang 1
  • 1 University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China

Abstract

We reproduce di-electron spectra in the region of 0 < m e+e < 4 GeV in both minimum bias and central Au+Au collisions at $\sqrt {s_{NN} } $ = 200 GeV measured by the STAR experiment. A cocktail simulation, incorporating STAR acceptance and detector responses, is able to describe the “enhancement” of the low mass region by including an in-medium modification of vector mesons and a thermal di-lepton calculation. We also predict the di-lepton mass spectra in RHIC lower energies via an extrapolation method. The evolution of Di-lepton mass spectra, effective temperature, and possible medium modifications versus colliding energies are studied to explore the QCD phase diagram.

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