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arXiv 1409.4655nucl-ex
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p-Pb碰撞中喷流的产生

Jet Production in p-Pb Collisions

Megan Connors

摘要:

高能重离子碰撞研究的主要结果之一是喷注淬灭现象的观察。在相同的能量下,相对于pp碰撞,重离子碰撞中观测到的喷注数目被抑制,这是由于夸克-胶子等离子体(QGP)中的部分子能量损失造成的.然而,由于在初始状态下存在核而引起的冷核物质效应也会影响这种测量。为了解开这些影响p-Pb碰撞的研究,QGP的形成预计不会发生,只有冷核物质的影响。p-Pb碰撞中的喷流除了是理解喷流淬灭的重要基线外,还可用于提供对核部分子分布函数的约束。本文报道了用ALICE跟踪系统和电磁量能器在$\sqrt{s_{NN}}=5.02$ TeV的p-Pb碰撞中测量到的完全重构喷流。除了光谱之外,还研究了p-Pb碰撞中的喷流碎裂行为。

英文摘要:

One of the major results from the study of high energy heavy ion collisions is the observation of jet quenching. The suppression of the number of jets observed in heavy ion collisions relative to pp collisions at the same energy scaled by the number of binary collisions, is attributed to partonic energy loss in the quark gluon plasma (QGP). However, cold nuclear matter effects due to the presence of a nucleus in the initial state could also influence this measurement. To disentangle these effects p-Pb collisions are studied, where QGP formation is not expected to occur and only cold nuclear matter effects are present. In addition to being an important baseline for understanding jet quenching, jets in p-Pb collisions may also be used to provide constraints on the nuclear parton distribution functions. Fully reconstructed jets measured using the ALICE tracking system and electro-magnetic calorimeter in p-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are reported. In addition to the spectra, studies of the jet fragmentation behavior in p-Pb collisions are also presented.

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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