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Direct photons: a nonequilibrium signal of the expanding quark-gluon plasma | | Shang-Yung Wang
; Daniel Boyanovsky
; Kin-Wang Ng
; | | Date: |
22 Dec 2000 | | Journal: | Nucl.Phys. A699 (2002) 819 | | Subject: | hep-ph nucl-ex nucl-th | | Abstract: | Direct photon production from a longitudinally expanding quark-gluon plasma (QGP) at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies is studied with a real-time kinetic description that is consistently incorporated with hydrodynamics. Within Bjorken’s hydrodynamical model, energy nonconserving (anti)quark bremsstrahlung q(ar{q}) o q(ar{q})gamma and quark-antiquark annihilation qar{q} o gamma are shown to be the dominant nonequilibrium effects during the transient lifetime of the QGP. For central collisions we find a significant excess of direct photons in the range of transverse momentum 1-2 lesssim p_T lesssim 5 GeV/c as compared to equilibrium results. The photon rapidity distribution exhibits a central plateau. The transverse momentum distribution at midrapidity falls off with a {em power law} p^{-
u}_T with 2.5 lesssim
u lesssim 3 as a consequence of these energy nonconserving processes, providing a distinct experimental {em nonequilibrium signature}. The power law exponent
u increases with the initial temperature of the QGP and hence with the total multiplicity rapidity distribution dN_pi/dy. | | Source: | arXiv, hep-ph/0101251 | | Services: | Forum | Review | PDF | Favorites | |
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