论文标题
在LHC的相对论重型离子碰撞中，用于包容性喷气机和$ Z^0+{\ rm jet} $的临时分布的中等修改
Medium modifications of girth distributions for inclusive jets and $Z^0+{\rm jet}$ in relativistic heavy-ion collisions at the LHC
论文作者
论文摘要
在本文中，我们调查了包容性喷气机的围栏发行版的介质修改和$ z^0 $标记的喷气机（$ r = 0.2 $）的PB+PB碰撞，带有$ \ sqrt {s} = 2.76 $ tev。 The partonic spectrum in the initial hard scattering of elementary collisions are obtained by a event generator POWHEG+PYTHIA, which matches the next-to-leading (NLO) matrix elements with parton showering, and energy loss of faster parton traversing in hot/dense QCD medium is calculated by Monte Carlo simulation within Higher-Twist formalism of jet quenching in heavy-ion collisions.我们介绍了$ \ sqrt {s} = 2.76 $ tev的P+P和Pb+Pb碰撞中的事件归一化围绕围绕围绕的模型计算，从而提供了对爱丽丝测量的很好描述。结果表明，相对于p+p中的围绕Pb+Pb中包含喷气机的周长分布转移到较低的周长区域。因此，在小围栏区域，围绕包含喷气机的围绕围栏的核修饰因子大于统一，而在大围栏区域的核修饰因子小于一个。这种行为是由于射流内部更多的软片段以及在重离子碰撞中引发的喷气机的分数改变。 We further predict the girth distributions for $Z^0$ boson tagged jets in Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, and demonstrate that the medium modification on girth distributions for $Z^0$ tagged jets is less pronounced as compared to that for inclusive jets because the dominant components of $Z^0$ tagged jets are quark-initiated jets.
In this paper we investigate the medium modifications of girth distributions for inclusive jets and $Z^0$ tagged jets with small radius ($R=0.2$) in Pb+Pb collisions with $\sqrt{s}=2.76$ TeV at the LHC. The partonic spectrum in the initial hard scattering of elementary collisions are obtained by a event generator POWHEG+PYTHIA, which matches the next-to-leading (NLO) matrix elements with parton showering, and energy loss of faster parton traversing in hot/dense QCD medium is calculated by Monte Carlo simulation within Higher-Twist formalism of jet quenching in heavy-ion collisions. We present the model calculations of event normalized girth distributions for inclusive jets in p+p and Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, which give nice descriptions of ALICE measurements. It is shown that the girth distributions of inclusive jets in Pb+Pb are shifted to lower girth region relative to that in p+p. Thus the nuclear modification factor of girth distributions for inclusive jets is larger than unity at small girth region, while smaller than one at large girth region. This behavior results from more soft fragments inside a jet as well as the fraction alteration of gluon/quark initiated jets in heavy-ion collisions. We further predict the girth distributions for $Z^0$ boson tagged jets in Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, and demonstrate that the medium modification on girth distributions for $Z^0$ tagged jets is less pronounced as compared to that for inclusive jets because the dominant components of $Z^0$ tagged jets are quark-initiated jets.
