Jet-photons from an anisotropic {\em Quark-Gluon-Plasma}

Abstract

We calculate the $p_T$ distributions of jet conversion photons from {\em Quark Gluon Plasma} with pre-equilibrium momentum-space anisotropy. A phenomenological model has been used for the time evolution of hard momentum scale $p_{\mathrm{hard}}(\tau )$ and anisotropy parameter $\xi (\tau )$. As a result of pre-equilibrium momentum-space anisotropy, we find significant modification of the jet conversion photon $p_T$ distribution. For example, with {\em fixed initial condition} (FIC) pre-equilibrium anisotropy, we predict significant enhancement of the jet-photon $p_T$ distribution in the entire region, whereas for pre-equilibrium anisotropy with {\em fixed final multiplicity} (FFM), suppression of the jet conversion photons $p_T$ distribution is observed. The results with FFM (as it is the most realistic situation) have been compared with high $p_T$ PHENIX photon data. It is found that the data is reproduced well if the isotropization time lies within $1.5$ fm/c.

15 pages, 11 eps figures, Accepted for publication in Journal of Physics G

References in corpus (8)

• Measurement of direct photon production in p + p collisions at sqrt(s) = 200 GeV
• Recent results in relativistic heavy ion collisions: from ``a new state of matter'' to "the perfect fluid"
• Pre-equilibrium dilepton production from an anisotropic quark-gluon plasma
• Photon production from an anisotropic quark-gluon plasma
• Measuring Quark-Gluon-Plasma Thermalization Time with Dileptons
• Suppression of forward dilepton production from an anisotropic quark-gluon plasma
• Photons from anisotropic Quark-Gluon-Plasma
• Measuring the isotropization time of quark-gluon plasma from direct photons at energies available at the BNL Relativistic Heavy Ion Collider (RHIC)

Cited by in corpus (4)

• Non-boost-invariant anisotropic dynamics
• Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
• Jet-dilepton conversion from an anisotropic quark-gluon plasma
• Gluon dissociation of $J/\psi$ in anisotropic {\em Quark-Gluon-Plasma}