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arXiv 1209.0478hep-phhep-exnucl-th
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在RHIC和LHC pp和pA碰撞中半包容光子强子的产生

Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC

Amir H. Rezaeian

摘要:

我们研究了RHIC中有色玻璃凝聚体(CGC)框架下的半包容光子-强子产生以及质子-质子(pp)和质子-核(pA)碰撞中的LHC能量。我们计算了光子强子对方位角关联的符合几率,并表明远侧关联具有双峰或单峰结构,这取决于触发粒子的选择和运动学。这种新的功能是独特的半包容性光子强子生产相比,一个类似的测量双包容性的双强子生产在PA碰撞。我们得到了在正向快度下pp和pA碰撞中,远离侧光子-强子关联出现双峰或单峰结构的运动学变量间的必要条件,并指出这一特征主要受p_T^强子/p_T^光子比值的控制。从QCD饱和物理的角度,可以理解远离侧光子强子产生的能量、快度和密度的增加导致的去相关以及双峰结构的出现。我们还预测了RHIC和LHC在前向快度下的单内含光子与强子产生的比率,以及半内含光子-强子对产生的二维核修正因子。

英文摘要:

We investigate semi-inclusive photon-hadron production in the color glass condensate (CGC) framework at RHIC and the LHC energies in proton-proton (pp) and proton-nucleus (pA) collisions. We calculate the coincidence probability for azimuthal correlation of pairs of photon-hadron and show that the away-side correlations have a double-peak or a single-peak structure depending on trigger particle selection and kinematics. This novel feature is unique for semi-inclusive photon-hadron production compared to a similar measurement for double inclusive dihadron production in pA collisions. We obtain necessary conditions between kinematics variables for the appearance of a double-peak or a single peak structure for the away-side photon-hadron correlations in pp and pA collisions at forward rapidities and show that this feature is mainly controlled by the ratio p_T^hadron/p_T^photon. Decorrelation of away-side photon-hadron production by increasing the energy, rapidity and density, and appearance of double-peak structure can be understood by QCD saturation physics. We also provide predictions for the ratio of single inclusive prompt photon to hadron production, and two-dimensional nuclear modification factor for the semi-inclusive photon-hadron pair production at RHIC and the LHC at forward rapidities.

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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