Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{NN}}$= 27, 39, and 62.4 GeV from the STAR Experiment - INSPIRE

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Measurements of Dielectron Production in Au $+$ Au Collisions at $\sqrt{s_{NN}}$ = 27, 39, and 62.4 GeV from the STAR Experiment

STAR

Collaboration

Oct 23, 2018

e-Print:

1810.10159 [nucl-ex]

Experiments:

BNL-RHIC-STAR

View in:

ADS Abstract Service

reference search27 citations

Citations per year

Abstract: (arXiv)

We report systematic measurements of dielectron (

e^{\pm}e^{\pm}

) invariant-mass

M_{ee}

spectra at mid-rapidity in Au+Au collisions at

\sqrt{s_{NN}}

= 27, 39, and 62.4 GeV taken with the STAR detector at the Relativistic Heavy Ion Collider. For all energies studied, a significant excess yield of dielectrons is observed in the low-mass region (0.40

< M_{ee} < 0.75

MeV/

c^2

) compared to hadronic cocktail simulations at freeze-out. Models that include an in-medium broadening of the

\rho

-meson spectral function consistently describe the observed excess. In addition, we report acceptance-corrected dielectron-excess spectra for Au+Au collisions at mid-rapidity (

\left|y_{ee}\right|

$

heavy ion: scattering
correction: acceptance
electron electron
STAR
mass spectrum
spectral representation
freeze-out
rapidity
experimental results
27 GeV-cms/nucleon 39 GeV-cms/nucleon 62.4 GeV-cms/nucleon

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