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arXiv 1705.02576nucl-th
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$\sqrt{s_{NN}}$ =2.76 TeV的Pb+Pb碰撞中的光子产生

Photon production in Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV

Yong-Ping Fu, Qin Xi

摘要:

在$\sqrt{s_{NN}}$ =2.76 TeV的大型强子对撞机(LHC)能量下,计算了不同中心度类的Pb+Pb碰撞产生的高能光子.采用WHS模型和BDMPS模型考虑了射流破碎、射流-光子转换和射流韧致辐射过程中的射流能量损失。利用(1+1)维理想相对论流体力学理论研究了夸克-胶子等离子体(QGP)的集体横向流和时空演化。在0- 20%、20- 40%和40- 80%中心度的情况下,计算结果与Pb+Pb碰撞($\sqrt{s_{NN}}$ = 2. 76 TeV)直接光子的ALICE数据符合得很好.

英文摘要:

We calculate the high energy photon production from the Pb+Pb collisions for different centrality classes at $\sqrt{s_{NN}}$=2.76 TeV Large Hadron Collider (LHC) energy. The jet energy loss in the jet fragmentation, jet-photon conversion and jet bremsstrahlung is considered by using the Wang-Huang-Sarcevic (WHS) and Baier-Dokshitzer-Mueller-Peigne-Schiff (BDMPS) models. We use the (1+1)-dimensional ideal relativistic hydrodynamics to study the collective transverse flow and space-time evolution of the quark gluon plasma (QGP). The numerical results agree well with the ALICE data of the direct photons from the Pb+Pb collisions ($\sqrt{s_{NN}}$=2.76 TeV) for 0-20\%, 20-40\% and 40-80\% centrality classes.

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