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arXiv 1408.0791nucl-ex
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高- $p_{_{T}}$直接光子方位相关测量

High-$p_{_{T}}$ Direct Photon Azimuthal Correlation Measurements

Ahmed M. Hamed

备注：
XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions. arXiv admin note: text overlap with arXiv:1408.0576
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摘要：

本文测量了质心能量为$\sqrt{s_{_{NN}}}=200$ ~GeV的Au+Au碰撞中产生的中快度直接光子（$γ_{_{dir}}$）和高横动量直接光子（$p_{_{T}}$）的方位角关联，并与相同运动学范围内的中性π介子（$π^{0}$）的方位角关联进行了比较.在高$p_{_{T}}$（$8< p_{_{T}}^{γ_{_{dir}}}<20$ ~GeV/ $c$）下，直接光子$v_{_{2}}^{γ_{_{dir}}}(p_{_{T}})$的方位角椭圆各向异性小于$π^{0}$的方位角椭圆各向异性，并且在使用前向探测器（$2.4 <|η|< 4.0$）重建事件平面时，方位角椭圆各向异性与零一致。在新测量的运动学范围（$12< p_{_{T}}^{γ_{_{dir}},π^{0}}<24$ ~GeV/ $c$和$3< p_{_{T}}^{assoc}<24$ ~GeV/ $c$）内，从$γ_{_{dir}}$反冲出的带电强子谱比从$π^{0}$ $(I_{AA}^{γ_{_{dir}}-h^{\pm}} < I_{AA}^{π^{0}-h^{\pm}})$反冲出的带电强子谱有更大的抑制作用。

英文摘要：

The azimuthal correlations of direct photons ($γ_{_{dir}}$) with high transverse momentum ($p_{_{T}}$), produced at mid-rapidity ($|η^{γ_{_{dir}}}|<1$) in Au+Au collisions at center-of-mass energy $\sqrt{s_{_{NN}}}=200$~GeV, are measured and compared to those of neutral pions ($π^{0}$) in the same kinematic range. The measured azimuthal elliptic anisotropy of direct photon, $v_{_{2}}^{γ_{_{dir}}}(p_{_{T}})$, at high $p_{_{T}}$ ($8< p_{_{T}}^{γ_{_{dir}}}<20$~GeV/$c$) is found to be smaller than that of $π^{0}$ and consistent with zero when using the forward detectors ($2.4 <|η|< 4.0$) in reconstructing the event plane. The associated charged hadron spectra recoiled from $γ_{_{dir}}$ show more suppression than those recoiled from $π^{0}$ $(I_{AA}^{γ_{_{dir}}-h^{\pm}} < I_{AA}^{π^{0}-h^{\pm}})$ in the new measured kinematic range $12< p_{_{T}}^{γ_{_{dir}},π^{0}}<24$~GeV/$c$ and $3< p_{_{T}}^{assoc}<24$~GeV/$c$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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