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arXiv 1607.04554hep-exnucl-ex
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在LHC用ALICE测量作为带电粒子多重性的函数的开放重味产生

Measurement of open heavy-flavour production as a function of charged-particle multiplicity with ALICE at the LHC

Sibaliso Mhlanga

摘要:

重夸克是在超相对论强子碰撞的早期阶段通过硬散射产生的,是研究强子碰撞中量子色动力学(QCD)各个方面的重要工具。带电粒子多重性提供了事件的全球特征信息,并可用于描述粒子产生机制。在大型强子对撞机(LHC)能量下的强子碰撞中,多部分子相互作用有着重要的贡献。作为带电粒子多重性的函数的重味产率的测量提供了深入了解在这些能量的强子碰撞中影响其产生的机制,并且它是测试多部分子相互作用的可能影响的工具。此外,带电粒子多重性依赖的开放重味被用来测试QCD理论模型来描述数据的能力。在ALICE中,重味的产生是通过强子和半轻子衰变通道(电子在中心快度,μ子在前向快度)测量的。带电粒子的多重性是在中央和前进的速度。我们将提出的结果开放的重味生产作为一个功能的带电粒子的多重性PP和pPb碰撞。结果将与夸克偶测量以及理论模型计算进行比较。

英文摘要:

Heavy quarks are produced in the early stages of ultra-relativistic hadron collisions via hard scatterings and are an important tool for studying different aspects of Quantum Chromodynamics (QCD) in hadronic collisions. Charged-particle multiplicity gives information on the global characteristics of the event and could be used to characterize particle production mechanisms. In hadronic collisions at Large Hadron Collider (LHC) energies, there is a significant contribution of multi-parton interactions. The measurement of heavy-flavour yields as a function of charged-particle multiplicity gives insight into the mechanisms influencing their production in hadronic collisions at these energies and it is a tool to test the possible influence of multi-parton interactions. Furthermore, the charged-particle multiplicity dependence of open heavy flavours is used to test the ability of QCD theoretical models to describe the data. In ALICE, heavy-flavour production is measured via the hadronic and semi-leptonic decay channels (electrons at central rapidity and muons at forward rapidity). Charged-particle multiplicity is measured at central and forward rapidity. We will present the results on open heavy-flavour production as a function of the charged-particle multiplicity in pp and pPb collisions. Results will be compared to quarkonia measurements as well as theoretical model calculations.

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