教師資料查詢 | 類別: 期刊論文 | 教師: 王尚勇 Shang-Yung Wang (瀏覽個人網頁)

標題:Direct photons: A nonequilibrium signal of the expanding quark-gluon plasma
學年90
學期1
出版(發表)日期2001/08/01
作品名稱Direct photons: A nonequilibrium signal of the expanding quark-gluon plasma
作品名稱(其他語言)
著者Wang, S.Y.; Boyanovsky, D.; Ng, K.W.
單位淡江大學物理學系
出版者
著錄名稱、卷期、頁數Nuclear Physics A 699, pp.819-846
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.
關鍵字Direct photon production;Quark–gluon plasma;Relativistic heavy-ion collisions;Finite-temperature field theory
語言英文
ISSN0375-9474;1873-1554
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別荷蘭
公開徵稿
出版型式,電子版,紙本
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