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arXiv · 1812.00391

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

Sa Wang·Wei Dai·Shan-Liang Zhang·Ben-Wei Zhang·Enke Wang
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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 $Δϕ=|ϕ_{b1}-ϕ_{b2}|$ region where the gluon splitting processes dominate relative to large $Δϕ$ region. The difference leads to a modest suppression on near side ($Δϕ\sim 0$) and enhancement on away side ($Δϕ\simπ$).

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Sa Wang, Wei Dai, Shan-Liang Zhang, Ben-Wei Zhang, Enke Wang. 2018-12-02. The production of $b\bar{b}$ dijet in heavy-ion collisions at the LHC. https://doi.org/10.22323/1.345.0091

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