The productions of inclusive b-jet and $b\bar{b}$ dijets in Pb+Pb collisions have been investigated by considering the heavy quark and the light quark in-medium evolution simultaneously. The initial hard processes of inclusive b-jet and $b\bar{b}$ dijets productions are described by a next-to-leading order (NLO) plus parton shower Monte Carlo (MC) event generator SHERPA which can be well-matched with the experimental data in p+p collisions. The framework combines the Langevin transport model to describe the evolution of the bottom quark also its collisional energy loss and the higher-twist description to consider the radiative energy loss of both the bottom and light quarks. We compare the theoretical simulation of inclusive jet and inclusive b-jet $R_{\rm AA}$ in Pb+Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV with the experimental data, and then present the theoretical simulation of the momentum balance of the $b\bar{b}$ dijet in Pb+Pb collisions at $5.02$ TeV with the recent CMS data for the first time. A similar trend as that in inclusive dijets has been observed in $b\bar{b}$ dijets, the production distribution is shifted to smaller $x_J$ due to the jet quenching effect. At last, the prediction of the normalized azimuthal angle distribution of the $b\bar{b}$ dijet in Pb+Pb collisions at $5.02$ TeV has been reported. The medium induced energy loss effect of the $b\bar{b}$ dijets will overall suppress its production, but the same side ($\Delta \phi \to 0$ region) suffers more energy loss than away side ($\Delta \phi \to \pi$ region), therefore lead to the suppression on the same side and the enhancement on the away side in the normalized azimuthal angle distribution in A+A collisions.

中文翻译：

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Pb+Pb 碰撞中 $b\bar{b}$ Dijets 的横向动量平衡和角分布

通过同时考虑重夸克和轻夸克在介质中的演化，研究了 Pb+Pb 碰撞中包含 b-jet 和 $b\bar{b}$ dijets 的产生。包含 b-jet 和 $b\bar{b}$ dijets 生产的初始硬过程由次先导顺序 (NLO) 加上部分淋浴蒙特卡洛 (MC) 事件生成器 SHERPA 描述，它可以很好地匹配与 p+p 碰撞中的实验数据。该框架结合了朗之万输运模型来描述底夸克的演化及其碰撞能量损失，并结合高扭曲描述来考虑底夸克和轻夸克的辐射能量损失。我们将在$\sqrt{s_{\rm NN}}=2.76$ TeV 下Pb+Pb 碰撞中inclusive jet 和inclusive b-jet $R_{\rm AA}$ 的理论模拟与实验数据进行比较，然后首次使用最近的 CMS 数据对 $b\bar{b}$ dijet 在 $5.02$ TeV 的 Pb+Pb 碰撞中的动量平衡进行理论模拟。在 $b\bar{b}$ dijets 中观察到与 inclusive dijets 类似的趋势，由于喷射淬火效应，生产分布转移到更小的 $x_J$。最后，已经报道了在$5.02$TeV的Pb+Pb碰撞中$b\bar{b}$dijet的归一化方位角分布的预测。$b\bar{b}$双射流的介质诱导能量损失效应将整体抑制其产生，但同侧（$\Delta \phi \to 0$区域）比远侧（$\Delta \phi \to \pi$ 区域），