Dielectron production in 200 GeV p+p and Au+Au collisions at STAR

30th Winter Workshop on Nuclear Dynamics

Guo, Yi

关键词: Au+Au collisions;    Expanding systems;    Interaction region;    Model calculations;    Relativistic heavy ion collision;    Space-time evolution;    STAR experiment;    Transverse mass spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/535/1/012006/pdf
DOI  :  10.1088/1742-6596/535/1/012006

来源: IOP

【 摘 要 】

Leptons do not interact strongly with the hot dense medium created in relativistic heavy ion collisions. They can escape the interaction region undistorted and thus carry direct information about the space-time evolution of the expanding system. In the low mass region (LMR, 0.3 ee2), dielectron mass spectra can provide the in-medium vector meson properties, while in the intermediate mass region (IMR, 1.1 ee2), the slope of dielectron transverse mass spectra is expected to have connection with the QGP temperature. In this paper, we present the centrality and pTdependence of the dielectron mass spectra measured in STAR experiment at RHIC. The data sets used in the analysis include large statistics samples collected during years 2010 for 200 GeV Au+Au collisions and 2012 for 200 GeV p+p collisions. In order to extract underlying physics, we will compare our results with model calculations.