Low- pT e+e- Pair Production in Au +Au Collisions at sNN =200 GeV and U + U Collisions at sNN =193 GeV at STAR

(STAR Collaboration)

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We report first measurements of e+e- pair production in the mass region 0.4<Mee<2.6 GeV/c2 at low transverse momentum (pT<0.15 GeV/c) in noncentral Au+Au collisions at sNN=200 GeV and U+U collisions at sNN=193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%-80% centrality of these collisions. The excess yields peak distinctly at low pT with a width (âpT2â

Original languageEnglish (US)
Article number132301
JournalPhysical Review Letters
Issue number13
StatePublished - Sep 25 2018


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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