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arXiv 2206.00367hep-phnucl-th
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LHC能量下质子-质子碰撞中存在重味过程时的底层事件活动性定义

Defining the Underlying-Event Activity in the Presence of Heavy-Flavour Processes in Proton-Proton Collisions at LHC Energies

László Gyulai, Szende Sándor, Róbert Vértesi

AI总结:

本研究利用PYTHIA 8分析13 TeV质子-质子碰撞中与硬过程相关的底层事件重味产生,对比不同触发方式的效果,提出可精细验证重味产生模型的方法。

摘要:

我们利用PYTHIA 8蒙特卡洛事件产生器,对质心系能量√s=13 TeV的质子-质子碰撞中,与领头硬过程相关的底层事件中的重味产生进行了系统分析。我们对比了通过领头强子触发筛选的事件结果,以及通过重建喷注触发的事件结果。研究表明,重味碎裂的运动学特性会增加底层事件表征的难度,而使用领头带电末态强子作为触发物的常规方法可能会削弱领头过程与伴随其产生的重味粒子之间的关联。然而,由轻味或重味喷注触发的事件保留了这种关联,能提供关于底层重味产生过程的更直接信息,但也可能引入对胶子辐射的非预期敏感性。本工作提出的方法为详细验证喷注及底层事件中轻味与重味产生的模型计算提供了手段。

英文摘要:

We present a systematic analysis of heavy-flavour production in the underlying event in connection to a leading hard process in pp collisions at $\sqrt{s}$ = 13 TeV, using the PYTHIA 8 Monte Carlo event generator. We compare results from events selected by triggering on the leading hadron, as well as those triggered with reconstructed jets. We show that the kinematics of heavy-flavour fragmentation complicates the characterisation of the underlying event, and the usual method which uses the leading charged final-state hadron as a trigger may wash away the connection between the leading process and the heavy-flavour particle created in association with that. Events triggered with light or heavy-flavour jets, however, retain this connection and bring more direct information on the underlying heavy-flavour production process, but may also import unwanted sensitivity to gluon radiation. The methods outlined in the current work provide means to verify model calculations for light and heavy-flavour production in the jet and the underlying event in great details.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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