Phenomenology of collinear photon emission from quark-gluon plasma in $AA$ collisions

Abstract

We study the role of running coupling and the effect of variation of the thermal quark mass on contribution of the collinear bremsstrahlung and annihilation to photon emission in $AA$ collisions in a scheme similar to that used in our previous jet quenching analyses. We find that for a scenario with the thermal quark mass $m_q\sim 50-100$ MeV contribution of the higher order collinear processes summed with the $2\to 2$ processes can explain a considerable part ($\sim 50$\%) of the experimental photon spectrum at $k_T\sim 2-3$ GeV for Au+Au collisions at $\sqrt{s}=0.2$ TeV. But for $m_q=300$ MeV and for the thermal quark mass predicted by the HTL scheme the theoretical predictions underestimate considerably the experimental spectrum.

6 pages, 2 figures

References in corpus (9)

• The QCD equation of state with dynamical quarks
• Electromagnetic response of quark-gluon plasma in heavy-ion collisions
• Parton energy loss in an expanding quark-gluon plasma: Radiative vs collisional
• Jet quenching with running coupling including radiative and collisional energy losses
• On the role of magnetic field in photon excess in heavy ion collisions
• The quark-gluon medium
• Effect of magnetic field on the photon radiation from quark-gluon plasma in heavy ion collisions
• Structure of a thermal quasifermion in the QCD/QED Medium
• Collinear Photon Emission from the Quark-Gluon Plasma: The Light-Cone Path Integral Formulation

Cited by in corpus (2)

• The Present and Future of QCD
• Photons production in heavy-ion collisions as a signal of deconfinement phase