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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Production of forward rapidity photons in high energy heavy ion collisions
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Production of forward rapidity photons in high energy heavy ion collisions

机译：在高能重离子碰撞中产生前向速度光子

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摘要

We consider production of prompt photons in high energy gold-gold and deuteron-gold collisions in the forward rapidity region of RHIC (γ ∼ 3.8). In this kinematics, the projectile partons typically have large x(bj) while the target partons are mostly at very small xbj, so that the primary partonic collisions involve valence quarks from the projectile and gluons from the target. We take the target nucleus to be a color glass condensate while the projectile deuteron or nucleus is treated as a dilute system of partons. We show that the photon production cross section can be written as a convolution of a quark-nucleus scattering cross section, involving a quark-antiquark dipole, with the leading order quark-photon fragmentation function. We consider different models of the quark-antiquark dipole and show that measurement of photons in the forward rapidity region at RHIC can distinguish between different parameterizations of the dipole cross section as well as help clarify the role of parton coalescence models in hadron production at RHIC. © 2005 Elsevier B.V. All rights reserved.
机译：我们考虑在RHIC的前向快速区域中，在高能金金和氘核金碰撞中产生快速光子（γ＆SIM; 3.8）。在这种运动学中，弹丸子部分通常具有较大的x（bj），而目标弹子通常具有非常小的xbj，因此主要的部分声波碰撞涉及弹丸的价夸克和靶标的胶子。我们将目标核作为有色玻璃的凝结物，而将射弹氘核或核视为稀疏的帕顿系统。我们证明，光子产生截面可以写为夸克-核夸克偶极子的夸克-核散射截面的卷积，具有领先的夸克-光子碎裂功能。我们考虑了夸克-反夸克偶极子的不同模型，并表明在RHIC的前向快速区域中对光子的测量可以区分偶极子截面的不同参数化，并有助于阐明parton聚结模型在RHIC的强子生产中的作用。 ＆复制; 2005 Elsevier B.V.保留所有权利。

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