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arXiv 0902.4000nucl-thhep-phnucl-ex
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具有光子-强子关联的高能核碰撞层析成像

Tomography of high-energy nuclear collisions with photon-hadron correlations

Hanzhong Zhang, J. F. Owens, Enke Wang, Xin-Nian Wang

摘要:

在次领先阶(NLO)微扰QCD(pQCD)部分子模型下,研究了高能重离子碰撞中部分子能量损失对伴随高$p_{T}$光子的远离侧强子谱的抑制.根据NLO pQCD中$γ$关联喷注谱的形状,大$z_T=p_T^{h}/p_T^γ \stackrel{>}{\sim} 1$强子谱对部分子能量损失更敏感,因此主要由$γ$关联喷注的表面发射决定,而小$z_{T}$强子谱主要来自能量降低的喷注的碎裂,而这种碎裂受体积发射的控制.这导致了不同的$z_{T}$值对$γ$ -强子抑制的中心依赖性不同.因此,一个完整的测量抑制的$γ$触发的强子谱,包括它的依赖于取向的$γ$ -强子对相对于反应平面,允许提取的喷流猝灭参数的空间分布,实现了真正的断层研究的夸克-胶子等离子体在高能重离子碰撞。

英文摘要:

Within the next-to-leading order (NLO) perturbative QCD (pQCD) parton model, suppression of away-side hadron spectra associated with a high $p_{T}$ photon due to parton energy loss is studied in high-energy heavy-ion collisions. Dictated by the shape of the $γ$-associated jet spectrum in NLO pQCD, hadron spectra at large $z_T=p_T^{h}/p_T^γ \stackrel{>}{\sim} 1$ are more sensitive to parton energy loss and therefore are dominated by surface emission of $γ$-associated jets, whereas small $z_{T}$ hadrons mainly come from fragmentation of jets with reduced energy which is controlled by the volume emission. These lead to different centrality dependence of the $γ$-hadron suppression for different values of $z_{T}$. Therefore, a complete measurement of the suppression of $γ$-triggered hadron spectra, including its dependence on the orientation of the $γ$-hadron pair with respect to the reaction plane, allows the extraction of the spatial distribution of jet quenching parameters, achieving a true tomographic study of the quark-gluon plasma in high-energy heavy-ion collisions.

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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