Direct photons: A nonequilibrium signal of the expanding quark-gluon plasma

doi:10.1016/S0375-9474(01)01288-X

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/72744

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题名:	Direct photons: A nonequilibrium signal of the expanding quark-gluon plasma
作者:	Wang, S.Y.;Boyanovsky, D.;Ng, K.W.
贡献者:	淡江大學物理學系
关键词:	Direct photon production;Quark–gluon plasma;Relativistic heavy-ion collisions;Finite-temperature field theory
日期:	2001-08
上传时间:	2011-10-24 11:05:36 (UTC+8)
摘要:	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(q̄)→q(q̄)γ and quark–antiquark annihilation qq̄→γ 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≲pT≲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 power law p−νT with 2.5≲ν≲3 as a consequence of these energy nonconserving processes, providing a distinct experimental nonequilibrium signature. The power law exponent ν increases with the initial temperature of the QGP and hence with the total multiplicity rapidity distribution dNπ/dy.
關聯:	Nuclear Physics A 699, pp.819-846
DOI:	10.1016/S0375-9474(01)01288-X
显示于类别:	[物理學系暨研究所] 期刊論文

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