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arXiv 1111.6605hep-phnucl-th
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射流中的碎裂:锥效应和阈值效应

Fragmentation in Jets: Cone and Threshold Effects

Massimiliano Procura, Wouter J. Waalewijn

摘要:

本文研究了在锥径为R的喷流中轻夸克和胶子碎裂成强子的过程。这样就可以比目前更全面地分析碎片化问题。强子能量分数z的半包容截面的形状用碎裂喷流函数(FJFs)来描述,我们用R和喷流能量E来计算。我们引入了一种新的联合重算方法来计算FJF中R和1-z的二重重算,这种方法同样适用于强子对撞机上的初态辐射。我们的结果在次领先对数阶表明,1-z的阈值矩阵的重申已经是重要的z > 0.5,并提高微扰理论的收敛性。我们的框架可用于分析LHC和RHIC数据,并测试和调整蒙特卡罗事件发生器。

英文摘要:

We study the fragmentation of (light) quarks and gluons to hadrons inside a jet of cone size R. This allows for a more exclusive analysis of fragmentation than is currently the case. The shape of semi-inclusive cross sections in the hadron energy fraction z is described by fragmenting jet functions (FJFs), which we calculate in terms of R and the jet energy E. We introduce a new joint resummation to sum the double logarithms of R and 1-z in the FJFs, which may similarly be applied to initial-state radiation at hadron colliders. Our results at next-to-leading logarithmic order indicate that the resummation of the threshold logarithms of 1-z is already important for z > 0.5 and improves the convergence of perturbation theory. Our framework may be used to analyze LHC and RHIC data and to test and tune Monte Carlo event generators.

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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