论文标题
高能核冲突中底部夸克的径向曲线
Radial profile of bottom quarks in jets in high-energy nuclear collisions
论文作者
论文摘要
重夸克（HQ）及其标记的射流之间的角相关性是潜在的新工具，可以深入了解相对论重离子碰撞中中等内部的党派相互作用。在这项工作中，我们介绍了第一项关于LHC pb+Pb碰撞中B介子径向介质的理论研究。 P+P中底部夸克标记的喷气机的初始生产是由Sherpa计算的，Sherpa将近代的订单矩阵元素与Parton Shower的贡献匹配，而Parton Shower的贡献，而大规模夸克遍历蒙特卡洛模型壳描述的QGP，可以同时模拟Langevin Voluge Langevin Voluge Langevin Villose Inframework的光线和重型风味。在P+P碰撞中，我们发现在较低的$ p_t^q $时，喷气机中重型味道的径向概况对重夸克质量很敏感。在$ 0-10 \％$ $ pb+pb碰撞时，在$ \ rm \ sqrt {s_ {s_ {nn}} = 5.02 $ tev中，我们观察到b-mesons radial radial profiles的反向修改模式，$ \ rm 4 <p_t q <p_t q <20 $ gev的范围与d频率相比：jot quat quin quin quin jot quin quin quin jot jeent：扩大了喷气机中的D介子。我们发现，在A+A碰撞中，从较高的$ \ rm p_t^q> 20 $ GEV区域自然而然地具有较窄的初始分布，因此导致径向轮廓的修改模式较窄；然而，重型风味内相互作用的扩散性质会导致径向剖面的更广泛的修饰模式。因此，这两种效果互相竞争和抵消，与喷气机相比，喷气机中的B夸克受益于前者的扩散效应较小，而越扩散效果则较小。这些发现可以在LHC的将来的实验测量中进行测试，以更好地了解喷气淬火的质量效应。
Angular correlations between heavy quark (HQ) and its tagged jet are potentially new tools to gain insight into the in-medium partonic interactions in relativistic heavy-ion collisions. In this work, we present the first theoretical study on the radial profiles of B mesons in jets in Pb+Pb collisions at the LHC. The initial production of bottom quark tagged jet in p+p is computed by SHERPA which matches the next-to-leading order matrix elements with contributions of parton shower, whereas the massive quark traversing the QGP described by a Monte Carlo model SHELL which can simultaneously simulate light and heavy flavor in-medium energy loss within the framework of Langevin evolution. In p+p collisions, we find that at lower $p_T^Q$ the radial profiles of heavy flavors in jets are sensitive to the heavy quark mass. In $0-10\%$ Pb+Pb collisions at $\rm \sqrt{s_{NN}}=5.02$ TeV, we observe an inverse modification pattern of the B mesons radial profiles in jets at $\rm 4<p_T^Q<20$ GeV compared to that of D mesons: the jet quenching effects narrow the jet radial profile of B mesons in jets while broaden that of D mesons in jets. We find that in A+A collisions, the contribution dissipated from the higher $\rm p_T^Q> 20$ GeV region naturally has a narrower initial distribution and consequently leads to a narrower modification pattern of radial profile; however the diffusion nature of the heavy flavor in-medium interactions will give rise to a broader modification pattern of radial profile. These two effects consequently compete and offset with each other, and the b quarks in jets benefit more from the former and suffers less diffusion effect compared to that of c quarks in jets. These findings can be tested in the future experimental measurements at the LHC to gain better understanding of the mass effect of jet quenching.
