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arXiv 2512.23398hep-ph
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在NNLO精度下C-angularity软函数的解析结果

Analytical results for the C-angularity soft function at NNLO

The University of Manchester(曼彻斯特大学);Durham University(杜伦大学);University of Cyprus(塞浦路斯大学);Trinity College, Dublin(都柏林三一学院)

Alexander Bennett, Emmet P. Byrne, Jonathan R. Gaunt, Elsa C. Lang

AI总结:

本文在NNLO精度下解析计算了C-angularity软函数及其异常维数,通过参数a的展开式实现了高精度结果。

摘要:

我们计算了名为C-angularity的一参数事件形状家族在NLO和NNLO精度下的软函数。该家族包含C参数作为参数的特例选择,与传统角量包含阈值作为特例类似。通过构造,C-angularity和角量在共线极限下一致,因此异常维数相同。然而,与角量不同,C-angularity是最终状态动量的连续可微函数,这使得计算C-angularity软函数的解析结果更简单。我们得到C-angularity软函数和异常维数在C-angularity参数a的展开式,分别到第三和第四阶。这些展开式在-1≤a<1范围内具有千分之几的精度。

英文摘要:

We compute the soft function at NLO and NNLO for a one-parameter family of event shapes we call C-angularity. This family contains C-parameter as a specific choice of the parameter, in close analogy with how conventional angularity contains thrust as a special case. By construction, C-angularity and angularity coincide in the collinear limit such that the anomalous dimensions are equal. However, unlike angularity, C-angularity is a continuously differentiable function of the final state momenta, which makes the analytic calculation of the C-angularity soft function simpler. We obtain analytical results for the C-angularity soft function and anomalous dimension as an expansion in the C-angularity parameter $a$, to third and fourth order in $a$ respectively. These expansions yield results that are accurate at the few per mille level for $-1\le a < 1$.

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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