Effects of chain decays, radial flow and U A (1) restoration on the low-mass dilepton enhancement in √S NN = 200 GeV Au+Au reactions

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Abstract

In √S NN = 200 GeV Au+Au collisions PHENIX reported a significant enhancement in the low-mass region (0.1 < m ee < 0.7 GeV) of the dielectron spectrum, which is still not fully understood. Several theoretical works and an indirect measurement suggest, due to the possible restoration of the U A (1) part of the chiral symmetry in a hot and dense medium, that the mass of the η′ meson may substantially decrease. This work reports on a statistically acceptable description of the PHENIX low-mass dilepton enhancement using a radial flow dominated meson spectra, chain decays of long-lived resonances and an in-medium η′ mass modification.

Original languageEnglish
Pages (from-to)553-559
Number of pages7
JournalCentral European Journal of Physics
Volume11
Issue number5
DOIs
Publication statusPublished - May 2013

Keywords

  • Brookhaven RHIC Coll
  • Collective flow
  • Dilepton production
  • Heavy Ion
  • Phase transition

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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