Effect of running coupling on photons from jet - plasma interaction in relativistic heavy ion collisions

Abstract

We discuss the role of collisional energy loss on high $p_T$ photon data measured by PHENIX collaboration by calculating photon yield in jet-plasma interaction. The phase space distribution of the participating jet is dynamically evolved by solving Fokker-Planck equation. We treat the strong coupling constant (${\alpha }_s$) as function of momentum and temperature while calculating the drag and diffusion coefficients. It is observed that the quenching factor is substantially modified as compared to the case when ${\alpha }_s$ is taken as constant. It is shown that the data is reasonably well reproduced when contributions from all the relevant sources are taken into account. Predictions at higher beam energies relevant for LHC experiment have been made.

8 pages, 8 eps figures, To appear in Journal of Physics G

References in corpus (19)

• How Much do Heavy Quarks Thermalize in a Heavy Ion Collision?
• Elastic, Inelastic, and Path Length Fluctuations in Jet Tomography
• Nuclear Modification of Electron Spectra and Implications for Heavy Quark Energy Loss in Au+Au Collisions at sqrt(s_NN)=200 GeV
• Thermalization of Heavy Quarks in the Quark-Gluon Plasma
• Towards an understanding of the RHIC single electron data
• Radiative and Collisional Jet Energy Loss in the Quark-Gluon Plasma at RHIC
• Energy Loss of Leading Hadrons and Direct Photon production in Evolving Quark-Gluon Plasma
• Chiral phase boundary of QCD at finite temperature
• Measurement of direct photon production in p + p collisions at sqrt(s) = 200 GeV
• Collisional Energy Loss in a Finite Size QCD Matter
• Radiative energy loss in a finite dynamical QCD medium
• Stopping power of hot QCD plasma
• Collisional Energy Loss of Non Asymptotic Jets in a QGP
• The Phenomenology of Elastic Energy Loss
• Retardation Effect for Collisional Energy Loss of Hard Partons Produced in a QGP
• Energy loss and dynamical evolution of quark $p_T$ spectra
• Effects of the Running of the QCD Coupling on the Energy Loss in the Quark-Gluon Plasma
• Quenching of light hadrons at RHIC in a collisional energy loss scenario
• Collisional parton energy loss in a finite size QCD medium revisited: Off mass-shell effects

Cited by in corpus (1)

• Effects of running couplings on jet conversion photons