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arXiv 1408.2371hep-exhep-phnucl-exnucl-th
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$\sqrt{s_{NN}}=200$ GeV在STAR上Au+Au碰撞中的直接光子产生

Direct photon production in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV at STAR

Chi Yang

摘要:

我们提出了直接光子产生$1<p_{T}<10$ GeV/ $c$来自连续介质中的双电子不变质量区$0.1<M_{ee}<0.3$ GeV/ $c^{2}$从10亿$\sqrt{s_{NN}}=200$ GeV Au+Au事件在2010年和2011年。在1-4 GeV/ $c$的\pt ~范围内,与二进制碰撞定标的$p+p$参考数相比,观察到明显的不变量产额过量。模型计算与热辐射和初始硬部分子散射的贡献是一致的直接光子不变产率的不确定性。

英文摘要:

We present the direct photon production for $1<p_{T}<10$ GeV/$c$ derived from continuum in the dielectron invariant mass region $0.1<M_{ee}<0.3$ GeV/$c^{2}$ from one billion $\sqrt{s_{NN}}=200$ GeV Au+Au events taken in year 2010 and 2011. A clear excess in the invariant yield compared to the number of binary collision scaled $p+p$ reference is observed in the \pt~range 1-4 GeV/$c$. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct photon invariant yield.

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