期刊論文
| 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 | en |
| ISSN | 0375-9474 1873-1554 |
| 期刊性質 | 國外 |
| 收錄於 | |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 否 |
| 國別 | NLD |
| 公開徵稿 | |
| 出版型式 | ,電子版,紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/72744 ) |