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arXiv 1503.06441nucl-ex
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用ALICE探测器测量$\sqrt{s_\mathrm{NN}} = 5.02$ TeV中p-Pb碰撞中带电喷流的中心性依赖

Centrality dependence of charged jets in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV measured with the ALICE detector

Rüdiger Haake

摘要:

高能喷流是研究核碰撞运动学和拓扑学的灵敏探针。喷流是带电粒子和中性粒子的准直喷雾,它们是在碰撞的早期阶段中硬散射部分子的碎裂中产生的。p-Pb碰撞中喷注谱的测量提供了一种重要的方法来量化初始状态下冷核物质对喷注产生、碎裂和强子化的影响。与Pb-Pb碰撞不同,强烈的核物质效应--例如来自夸克-胶子等离子体形成的效应--预计不会在p-Pb碰撞中发生。因此,冷核物质效应可以单独研究。冷核物质效应对带电喷流光谱的影响预计取决于事件中心性。更高的事件中心性主要与质子和铅核相互作用的更高概率有关,因此也与可能的核修改有关。本文是一次会议的论文集,其中首次展示了用ALICE测量的p-Pb中带电喷注的中心依赖性质。这里的重点是完全修正的喷流产生截面和核修正系数。此外,通过比较不同分辨率参数下重构的射流谱,对射流径向结构进行了研究。

英文摘要:

Highly energetic jets are sensitive probes for the kinematics and the topology of nuclear collisions. Jets are collimated sprays of charged and neutral particles, which are produced in the fragmentation of hard scattered partons in an early stage of the collision. The measurement of jet spectra in p-Pb collisions provides an important way of quantifying the effects of cold nuclear matter in the initial state on jet production, fragmentation, and hadronization. Unlike in Pb-Pb collisions, strong hot nuclear matter effects - e.g. from quark-gluon plasma formation - are not expected to occur in p-Pb collisions. Hence, cold nuclear matter effects can be investigated in isolation. The impact of cold nuclear matter effects on charged jet spectra is expected to depend on the event centrality. Higher event centralities are principally connected to a higher probability for an interaction of proton and lead-nucleus and therefore also for a possible nuclear modification. This article is the conference proceeding of a talk, in which centrality-dependent properties of charged jets in p-Pb measured by ALICE were shown for the first time. The focus is here on the fully corrected jet production cross sections and the nuclear modification factors. Additionally, the jet radial structure is explored by comparing jet spectra reconstructed with different resolution parameters.

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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