arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.2205nucl-th
收藏

重离子碰撞中高p_T触发器近、远侧喷注中的强子关联

Hadron Correlation in Jets on the Near and Away Sides of High-p_T Triggers in Heavy-ion Collisions

Rudolph C. Hwa, C. B. Yang

摘要:

研究了重离子碰撞中高p_T触发器近侧和远侧产生的喷流中触发器与伴随粒子的相关性。两侧喷流的强子化用热簇射和热簇射复合处理。穿过核介质的半硬和硬部分子的能量损失的参数化的方式,呈现良好的拟合的单粒子包容性分布在所有的中心。由于触发偏置的存在,近侧喷流中的强子分布对系统大小的依赖性很弱。与数据一致的触发动量的反斜率增加。在远离侧射流中的相关颗粒的分布也进行了研究,仔细注意到antitrigger偏置,这是由于较长的路径长度,远离侧射流反冲对触发射流必须在介质中传播到达对面。中心性依赖考虑后,确定一个现实的概率分布的动力学路径长度的部分子轨迹内的每一类中心性。对于p_T^{n}=p_T^{asn}(away)的对称双射流,每次触发的屈服由切向射流控制。对于固定的p_T^{asn}和中心性以及任何可测量的p_T^{asn}(远离),反冲喷流的平均部分子动量总是大于触发喷流的平均部分子动量。通过对这里描述的双射流产生的综合处理,可以回答许多关于在可测量的强子动量上指定的条件下介质中部分子的行为的问题。

英文摘要:

Correlation between trigger and associated particles in jets produced on near and away sides of high-p_T triggers in heavy-ion collisions is studied. Hadronization of jets on both sides is treated by thermal-shower and shower-shower recombination. Energy loss of semihard and hard partons traversing the nuclear medium is parametrized in a way that renders good fit of the single-particle inclusive distributions at all centralities. The associated hadron distribution in the near-side jet can be determined showing weak dependence on system size because of trigger bias. The inverse slope increases with trigger momentum in agreement with data. The distribution of associated particle in the away-side jet is also studied with careful attention given to antitrigger bias that is due to the longer path length that the away-side jet recoiling against the trigger jet must propagate in the medium to reach the opposite side. Centrality dependence is taken into account after determining a realistic probability distribution of the dynamical path length of the parton trajectory within each class of centrality. For symmetric dijets with p_T^{trig}=p_T^{assoc}(away) it is shown that the per-trigger yield is dominated by tangential jets. The average parton momentum for the recoil jet is shown to be always larger than that of the trigger jet for fixed p_T^{trig} and centrality and for any measurable p_T^{assoc}(away). With the comprehensive treatment of dijet production described here it is possible to answer many questions regarding the behavior of partons in the medium under conditions that can be specified on measurable hadron momenta.

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。

↑