Photons from anisotropic Quark-Gluon-Plasma

Abstract

We calculate medium photons due to Compton and annihilation processes in an anisotropic media. The effects of time-dependent momentum-space anisotropy of {\em Quark-Gluon-Plasma} (QGP) on the medium photon production are discussed. Such an anisotropy can results from the initial rapid longitudinal expansion of the matter, created in relativistic heavy ion collisions. A phenomenological model for the time-dependence of the parton hard momentum scale, $p_{hard}(\tau )$, and anisotropy parameter, $\xi (\tau )$, has been used to describe the plasma space-time evolution. We find significant dependency of photon yield on the isotropization time (${\tau }_{iso}$). It is shown that the introduction of early time momentum-space anisotropy can enhance the photon production by a factor of $10(1.5)$ (in the central rapidity region) for {\em free streaming} ({\em collisionally-broadened}) {\em interpolating} model if we assume fixed initial condition. On the other hand, enforcing the fixed final multiplicity significantly reduces the enhancement of medium photon production.

15 pages, 19 figures, few refs added, one new paragraph is added in introduction, published in Physical Rev. C

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• Radiative energy loss in a finite dynamical QCD medium
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Cited by in corpus (15)

• Photon production from a non-equilibrium quark-gluon plasma
• Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
• Yoctosecond photon pulses from quark-gluon plasmas
• Matching pre-equilibrium dynamics and viscous hydrodynamics
• Measuring the isotropization time of quark-gluon plasma from direct photons at energies available at the BNL Relativistic Heavy Ion Collider (RHIC)
• Wake potential in collisional anisotropic quark-gluon plasma
• Wake in anisotropic Quark-Gluon Plasma
• Rapidity distribution of photons from an anisotropic Quark-Gluon-Plasma
• Covariant formulation of gluon self-energy in presence of ellipsoidal anisotropy
• Jet-photons from an anisotropic {\em Quark-Gluon-Plasma}
• Azimuthal anisotropy and multiplicities of hard photons and free nucleons in intermediate-energy heavy-ion collisions
• Thermal photon production in Au+Au collisions: viscous corrections in two different hydrodynamic formalisms
• Gluon dissociation of $J/\psi$ in anisotropic {\em Quark-Gluon-Plasma}
• Two Photon Correlation in Anisotropic Quark-gluon plasma (aQGP)
• Estimation of isotropization time (${\tau }_{\mathrm{iso}}$) of QGP from direct photons