学術雑誌論文 Direct virtual photon production in Au+Au collisions at √ sNN = 200 GeV

STAR Collaboration  ,  Esumi , S.

770pp.451 - 458 , 2017-07 , Elsevier
ISSN:0370-2693
NII書誌ID(NCID):AA00774026
内容記述
We report the direct virtual photon invariant yields in the transverse momentum ranges 1 < pT < 3 GeV/c and 5 < pT < 10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10 < Mee < 0.28 GeV/c2 for 0–80% minimum-bias Au+Au collisions at √sNN = 200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function T AA scaled p + p reference is observed in the pT range 1 < pT <3 GeV/c. For pT >6 GeV/c the production follows T AA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.
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