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Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma

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arxiv 1409.4778 v1 pith:GNXDWQFR submitted 2014-09-16 hep-ph nucl-exnucl-th

C. Gale , Y. Hidaka , S. Jeon , S. Lin , J.-F. Paquet , R. D. Pisarski , D. Satow , V. V. Skokov
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G. Vujanovic
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classification hep-phnucl-exnucl-th
keywords dileptonsphotonsflowproductionsemi-qgpplasmasmallthermal
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We consider the thermal production of dileptons and photons at temperatures above the critical temperature in QCD. We use a model where color excitations are suppressed by a small value of the Polyakov loop, the semi Quark-Gluon Plasma (QGP). Comparing the semi-QGP to the perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer hard photons from the semi-QGP than the usual QGP. To illustrate the possible effects on photon and dileptons production in heavy ion collisions, we integrate the rate with a realistic hydrodynamic simulation. Dileptons uniformly exhibit a small flow, but the strong suppression of photons in the semi-QGP tends to bias the elliptical flow of photons to that generated in the hadronic phase.

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Cited by 3 Pith papers

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    An analytic hydrodynamic model with QGP and hadronic photon sources reproduces measured non-prompt direct photon spectra in 200 GeV Au+Au collisions and extracts centrality-dependent initial temperatures.

  3. The equation of state for neutron stars

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