Dielectron Azimuthal Anisotropy at mid-rapidity in Au+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV

Abstract

We report on the first measurement of the azimuthal anisotropy ($v_2$) of dielectrons ($e^{+}{e}^{-}$ pairs) at mid-rapidity from $\sqrt{s_{{}_{NN}}}=200$ GeV Au+Au collisions with the STAR detector at RHIC, presented as a function of transverse momentum ($p_T$) for different invariant-mass regions. In the mass region $M_{ee}<1.1$ GeV/$c^2$ the dielectron $v_2$ measurements are found to be consistent with expectations from ${\pi }^0$, $\eta$, $\omega$ and $\varphi$ decay contributions. In the mass region $1.1<M_{ee}<2.9$ GeV/$c^2$, the measured dielectron $v_2$ is consistent, within experimental uncertainties, with that from the $c\bar{c}$ contributions.

15 pages, 22 figures, published at PRC

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Cited by in corpus (7)

• Properties of hot and dense matter from relativistic heavy ion collisions
• Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV from the STAR Experiment
• Electromagnetic radiation as a probe of the initial state and of viscous dynamics in relativistic nuclear collisions
• The low and intermediate mass dilepton and photon results
• Production rate and ellipticity of lepton pairs from a rotating hot and dense QCD medium
• Overview of electromagnetic probes in ultra-relativistic heavy-ion collisions
• Electromagnetic & Weak Probes: Experimental Overview