The production of $b\bar{b}$ dijet in heavy-ion collisions at the LHC

Abstract

We report our recent theoretical calculations for $b\bar{b}$ dijet production in high-energy nuclear collisions. The NLO+parton shower (PS) event generator SHERPA has been employed to provide the pp baseline of $b\bar{b}$ dijet production. A framework which combines Langevin transport equation to describe the evolution of heavy quarks and the higher-twist scheme to consider the inelastic energy loss of both light and heavy partons has been implemented. Within this framework, we present the theoretical result of transverse momentum imbalance $x_J=p_{T1}/p_{T2}$ both for inclusive dijet and $b\bar{b}$ dijet in Pb+Pb collision at 5.02 TeV. The energy loss of b jet would shift $x_J$ to smaller value relative to p+p reference which is consistent with the CMS data. In addition, we show the medium modification for angular correlation of $b\bar{b}$ dijet in A+A collision at $\sqrt{s_{NN}}=5.02$~TeV. We observe a stronger suppression in small $\Delta \varphi =|{\varphi }_{b1}-{\varphi }_{b2}|$ region where the gluon splitting processes dominate relative to large $\Delta \varphi$ region. The difference leads to a modest suppression on near side ($\Delta \varphi \sim 0$) and enhancement on away side ($\Delta \varphi \sim \pi$).

Comments: 4 pages, 4 figures, Parallel talk presented at Hard Probes 2018