arXiv 1303.06752013-03-04nucl-thhep-phnucl-ex

用热光子和轻子对表征夸克-胶子等离子体

Characterizing quark gluon plasma by thermal photons and lepton pairs

Sukanya Mitra, Payal Mohanty, Sabyasachi Ghosh, Sourav Sarkar, Jan-e Alam

备注：: One LaTeX file for text and five eps files for figure. arXiv admin note: text overlap with arXiv:0910.4856

摘要：

本文分析了ALICE合作组在大型强子对撞机（LHC）能区Pb+Pb碰撞中测量的光子谱，以期提取这些碰撞中形成的热系统的性质。分析的结果进行了比较与以前研究的光谱测量在超级质子同步加速器（SPS）和相对论重离子对撞机（RHIC）的能量。在相同的碰撞条件下，用热光子谱约束初始条件，预测了LHC能区Pb+Pb碰撞的热双轻子谱。光子的斜率已被用来估计与系统的带电粒子多重性的有效简并度的上升。利用不同不变质量窗口下轻子对谱的斜率推测了高温相的平均径向流速。

英文摘要：

The photon spectra measured by the ALICE collaboration in Pb+Pb collisions at Large Hadron Collider (LHC) energies has been analyzed with a view of extracting the properties of thermal system formed in these collisions. The results of the analysis are compared with the previously studied spectra measured at Super Proton Synchrotron (SPS) and Relativistic Heavy Ion Collider (RHIC) energies. The thermal dilepton spectra from the Pb+Pb collision at LHC energy has been predicted for the initial conditions constrained by the thermal photon spectra at the same collision conditions. The slope of the photon has been used to estimate the rise in the effective degeneracy with the charged particle multiplicity of the system. The slopes of the lepton pair spectra for different invariant mass windows have been used to conjecture the average radial flow velocity of the high temperature phase.

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