Direct virtual photon production in Au plus Au collisions at root s(NN)=200 GeV STAR Collaboration
Author
Year
2017
Scientific journal
Physics Letters B, 770, 451-458
Web
Abstract
We report the direct virtual photon invariant yields in the transverse momentum ranges 1 < P-T < 3 GeV/c and 5 < p(T) < 10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10 < M-ee < 0.28 GeV/c(2) for 0-80% minimum-bias Au+Au collisions at root s(NN) = 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 p(T) range 1 < P-T < 3 GeV/c. For P-T > 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. (C) 2017 The Author. Published by Elsevier B.V.
Cite article as:
L. Adamczyk, R. Lednický, . et al., "Direct virtual photon production in Au plus Au collisions at root s(NN)=200 GeV STAR Collaboration", Physics Letters B, 770, 451-458 (2017)