Quenching of jets tagged with W bosons in high-energy nuclear collisions
Quenching of jets tagged with W bosons in high-energy nuclear collisions
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DOI：
10.1103/physrevc.105.054902
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发表时间：
2021-03
影响因子：
3.1
通讯作者：
Shan-Liang Zhang;Xin-Nian Wang;Ben-Wei Zhang
中科院分区：
文献类型：
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作者：
Shan-Liang Zhang;Xin-Nian Wang;Ben-Wei Zhang
我们进行了第一次详细的计算与$W$规范玻色子在铅+铅碰撞在大型强子对撞机（LHC）的喷流产生。在我们的计算中，$W$+喷流的产生在p+p碰撞作为一个参考是由夏尔巴，它执行次到领先的一阶矩阵元计算匹配的部分子簇射模拟的重申，而喷流的传播和介质响应的夸克胶子等离子体中的线性玻尔兹曼输运（LBT）模型进行了模拟。本文对Pb+Pb碰撞中喷注猝灭产生W+喷注的7个观测量进行了数值预测：标记喷注截面的介质修正因子I_{AA}$，N_{jets}\ge 2$事件中两个主导喷注之间不变质量的分布，缺失的p_T$或轻子与喷注横向动量的矢量和$|\vec{p}_T^{Miss}|$、事件$S_T$中所有喷流的标量$p_T$、横向动量不平衡$x_{jW}$、每个$W$玻色子$R_{jW}$的平均喷流数以及$W$玻色子和喷流之间的方位角$\Delta \phi_{jW}$。本文详细讨论了Pb+Pb碰撞中这七个观测量相对于p+p碰撞中的核修正。
We carry out the first detailed calculations of jet production associated with $W$ gauge bosons in Pb+Pb collisions at the Large Hadron Collider (LHC). In our calculations, the production of $W$+jet in p+p collisions as a reference is obtained by Sherpa, which performs next-to-leading-order matrix element calculations matched to the resummation of parton shower simulations, while jet propagation and medium response in the quark-gluon plasma are simulated with the Linear Boltzmann Transport (LBT) model. We provide numerical predictions on seven observables of $W$+jet production with jet quenching in Pb+Pb collisions: the medium modification factor for the tagged jet cross sections $I_{AA}$, the distribution in invariant mass between the two leading jets in $N_{jets}\ge 2$ events $m_{jj}$, the missing $p_T$ or the vector sum of the lepton and jet transverse momentum $|\vec{p}_T^{Miss}|$, the summed scalar $p_T$ of all the jets in an event $S_T$, transverse momentum imbalance $x_{jW}$, average number of jets per $W$ boson $R_{jW}$, and azimuthal angle between the $W$ boson and jets $\Delta \phi_{jW}$. The distinct nuclear modifications of these seven observables in Pb+Pb relative to that in p+p collisions are presented with detailed discussions.