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arXiv 1209.3019hep-phnucl-th
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计算射流的电荷

Calculating the Charge of a Jet

Wouter J. Waalewijn

摘要:

喷射荷电在实验验证Parton模型和标准模型中发挥了重要作用,并具有许多潜在的LHC应用。喷流的能量加权电荷不是红外安全量,因此必须考虑强子化。在这里,我们开发的形式主义来计算它,干净地分离的非微扰的微扰物理,我们计算在一个循环的顺序。我们首先研究的平均值和宽度的喷流电荷分布,其中的非微扰输入有关(双强子)碎裂功能。在另一种新颖的方法中,我们考虑了完整的非微扰射流电荷分布,并计算其演变和射流算法修正,这具有自然的蒙特卡洛式实现。我们的数值结果相比,Pythia和同意,以及在几乎所有的情况下。这种计算可以直接扩展到类似的轨道为基础的可观测量,如总的轨道动量产生的能量部分子。

英文摘要:

Jet charge has played an important role in experimentally testing the Parton Model and the Standard Model, and has many potential LHC applications. The energy-weighted charge of a jet is not an infrared-safe quantity, so hadronization must be taken into account. Here we develop the formalism to calculate it, cleanly separating the nonperturbative from the perturbative physics, which we compute at one-loop order. We first study the average and width of the jet charge distribution, for which the nonperturbative input is related to (dihadron) fragmentation functions. In an alternative and novel approach, we consider the full nonperturbative jet charge distribution and calculate its evolution and jet algorithm corrections, which has a natural Monte Carlo-style implementation. Our numerical results are compared to Pythia and agree well in almost all cases. This calculation can directly be extended to similar track-based observables, such as the total track momentum generated by an energetic parton.

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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