Direct virtual photon production in Au+Au collisions at sNN=200 GeV

STAR Collaboration

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

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 TAA scaled p+p reference is observed in the pT range 1<pT<3 GeV/c. For pT>6 GeV/c the production follows TAA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

Original languageEnglish (US)
Pages (from-to)451-458
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume770
DOIs
StatePublished - Jul 10 2017

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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