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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Measurement of inclusive jet charged-particle fragmentation functions in Pb plus Pb collisions at root S-NN=2.76 TeV with the ATLAS detector
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Measurement of inclusive jet charged-particle fragmentation functions in Pb plus Pb collisions at root S-NN=2.76 TeV with the ATLAS detector

机译:使用ATLAS探测器测量根S-NN = 2.76 TeV处铅与铅碰撞中包含的射流带电粒子破碎功能

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摘要

Measurements of charged-particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions can provide insight into the modification of parton showers in the hot, dense medium created in the collisions. ATLAS has measured jets in root S-NN = 2.76 TeV Pb+Pb collisions at the LHC using a data set recorded in 2011 with an integrated luminosity of 0.14 nb(-1). Jets were reconstructed using the anti-k(t) algorithm with distance parameter values R = 0.2, 0.3, and 0.4. Distributions of charged-particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality for R = 0.4 jets with p(T)(jet) > 100 GeV. Commensurate minimum p(T) values are used for the other radii. Ratios of fragment distributions in each centrality bin to those measured in the most peripheral bin are presented. These ratios show a reduction of fragment yield in central collisions relative to peripheral collisions at intermediate z values, 0.04 less than or similar to z less than or similar to 0.2, and an enhancement in fragment yield for z less than or similar to 0.04. A smaller, less significant enhancement is observed at large z and large p(T) in central collisions. (C) 2014 The Authors. Published by Elsevier B.V.
机译:对超相对论核碰撞中产生的射流的带电粒子破碎功能的测量,可以提供洞察,以了解在碰撞中产生的高温稠密介质中的帕顿阵雨的变化。 ATLAS使用2011年记录的数据(积分光度为0.14 nb(-1))测量了大型强子对撞机在根S-NN = 2.76 TeV Pb + Pb碰撞中的射流。使用anti-k(t)算法以距离参数值R = 0.2、0.3和0.4重建喷气飞机。在p =(T)(jet)> 100 GeV的情况下,在R = 0.4射流的碰撞中心中,七个碰撞点的带电粒子横向动量和纵向动量分数的分布得到了报告。相应的最小p(T)值用于其他半径。给出了每个中心区域中的片段分布与最外围区域中测得的片段比例。这些比率显示,在中间z值处,中心碰撞中的碎片产量相对于外围碰撞而言降低,小于或相似于z的0.04小于或相似于0.2,而z小于或相似于0.04的碎片产量提高。在中央碰撞中,在较大的z和较大的p(T)处观察到较小,较不明显的增强。 (C)2014作者。由Elsevier B.V.发布

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