2015
DOI: 10.1103/physrevlett.114.072301
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Production and Elliptic Flow of Dileptons and Photons in a Matrix Model of the Quark-Gluon Plasma

Abstract: 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 … Show more

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Cited by 98 publications
(85 citation statements)
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References 90 publications
(88 reference statements)
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“…With heavy quarks, it has been used to compute the critical endpoint for deconfinement [24] and properties of the Roberge-Weiss transition [25]. The production of dileptons and photons has also been computed [26]; the suppression of photon production in the semi-QGP may help to understand the experimentally measured azimuthal anisotropy of photons. In a matrix model, collisional energy loss behaves like the shear viscosity, and is suppressed as the density of color charges decreases [27].…”
Section: Introductionmentioning
confidence: 99%
“…With heavy quarks, it has been used to compute the critical endpoint for deconfinement [24] and properties of the Roberge-Weiss transition [25]. The production of dileptons and photons has also been computed [26]; the suppression of photon production in the semi-QGP may help to understand the experimentally measured azimuthal anisotropy of photons. In a matrix model, collisional energy loss behaves like the shear viscosity, and is suppressed as the density of color charges decreases [27].…”
Section: Introductionmentioning
confidence: 99%
“…That is, while we start with only Fermi-Dirac distribution functions with Q a = 0, in the confined phase at infinite N we end up with a Bose-Einstein distribution function, which corresponds to the mesonic distribution function instead of the quark and the anti-quark. We also note that, previously we showed that the cancellation of the phases of the quark and the anti-quark are essential for the non-suppression of the dilepton rate at large N by using the Boltzmann approximation [98]. From the discussion above, we see that the cancellation (m = m ) is important also in the case that we do not use the Boltzmann approximation.…”
Section: Jhep10(2015)005mentioning
confidence: 77%
“…A brief summary of the results of this analysis has appeared previously [98]. In this paper we describe the computations in full.…”
Section: Jhep10(2015)005mentioning
confidence: 99%
“…On the other hand, from most of theoretical predictions, the direct-photon spectra are underestimated as well. There have been intensive studies to reconcile the tension between experimental observations and theoretical predictions [5][6][7][8]. Furthermore, some of novel mechanisms such as the enhanced thermal-photon production from strong magnetic fields were considered [9,10].…”
Section: Introductionmentioning
confidence: 99%