Dielectron Mass Spectra from Au+Au Collisions at sNN=200GeV

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. Lett. 113, 022301 – Published 9 July 2014; Erratum Phys. Rev. Lett. 113, 049903 (2014)

Abstract

We report the STAR measurements of dielectron (e+e) production at midrapidity (|yee|<1) in Au+Au collisions at sNN=200GeV. The measurements are evaluated in different invariant mass regions with a focus on 0.30–0.76 (ρ-like), 0.76–0.80 (ω-like), and 0.98–1.05 (ϕ-like)   GeV/c2. The spectrum in the ω-like and ϕ-like regions can be well described by the hadronic cocktail simulation. In the ρ-like region, however, the vacuum ρ spectral function cannot describe the shape of the dielectron excess. In this range, an enhancement of 1.77±0.11(stat)±0.24(syst)±0.33(cocktail) is determined with respect to the hadronic cocktail simulation that excludes the ρ meson. The excess yield in the ρ-like region increases with the number of collision participants faster than the ω and ϕ yields. Theoretical models with broadened ρ contributions through interactions with constituents in the hot QCD medium provide a consistent description of the dilepton mass spectra for the measurement presented here and the earlier data at the Super Proton Synchrotron energies.

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  • Received 31 December 2013
  • Publisher error corrected 14 July 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.022301

© 2014 American Physical Society

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14 July 2014

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Vol. 113, Iss. 2 — 11 July 2014

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