Probing transverse momentum broadening via dihadron and hadron-jet angular correlations in relativistic heavy-ion collisions

Probing transverse momentum broadening via dihadron and hadron-jet angular correlations in relativistic heavy-ion collisions
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通过相对论重离子碰撞中双强子和强子-射流角相关性探测横向动量展宽

DOI:
10.1016/j.physletb.2017.09.031
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发表时间:
2016-07
期刊:
影响因子:
4.4
通讯作者:
Zhang Han-Zhong
Zhang Han-Zhong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chen Lin;Qin Guang-You;Wei Shu-Yi;Xiao Bo-Wen;Zhang Han-Zhong

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双喷注、双强子、强子喷注角关联被认为是研究相对论核碰撞中横动量展宽效应的重要途径。当硬碰撞产生的一对高能喷流穿过重离子碰撞产生的夸克-胶子等离子体时,由于与Sudakov粒子相关的真空软胶子辐射和介质诱导的横向动量加宽,它们变得去关联。本文首次采用系统的再确认方法,建立了一个基线计算模型来描述pp和外围AA碰撞中的双强子和强子喷注角关联数据,其中介质效应是可以忽略的。我们证明,介质诱导的加宽< p <$2>和所谓的喷流猝灭参数q <$2可以从AA碰撞中观察到的角去关联中提取。对双强子和强子喷注角关联数据的整体χ 2分析表明,RHIC顶能夸克喷注的< p 2>为13− 4+ 5 GeV 2。沿着这项工作的方向进一步的实验和理论努力将显着推进横向动量加宽的定量理解,并帮助我们获得相对论重离子碰撞中喷流猝灭参数的前所未有的知识。沿着这项工作的方向进一步的实验和理论努力将显着推进横向动量加宽的定量理解,并帮助我们获得前所未有的知识。
Dijet, dihadron, hadron-jet angular correlations have been reckoned as important probes of the transverse momentum broadening effects in relativistic nuclear collisions. When a pair of high-energy jets created in hard collisions traverse the quark–gluon plasma produced in heavy-ion collisions, they become de-correlated due to the vacuum soft gluon radiation associated with the Sudakov logarithms and the medium-induced transverse momentum broadening. For the first time, we employ the systematical resummation formalism and establish a baseline calculation to describe the dihadron and hadron-jet angular correlation data in pp and peripheral AA collisions where the medium effect is negligible. We demonstrate that the medium-induced broadening< p⊥ 2> and the so-called jet quenching parameter q ˆ can be extracted from the angular de-correlations observed in AA collisions. A global χ 2 analysis of dihadron and hadron-jet angular correlation data renders< p⊥ 2>∼ 13− 4+ 5 GeV 2 for a quark jet at RHIC top energy. Further experimental and theoretical efforts along the direction of this work shall significantly advance the quantitative understanding of transverse momentum broadening and help us acquire unprecedented knowledge of jet quenching parameter in relativistic heavy-ion collisions.
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