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arXiv 2006.14680hep-phhep-ex
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微扰理论中射流疏导的改进

Improving the Understanding of Jet Grooming in Perturbation Theory

Andrew J. Larkoski

摘要:

喷流疏导已成为精密喷流物理研究中一个必要而有力的工具。本文给出了微扰理论中喷流梳理的三个结果,重点讨论了用改进的质量降标记器对$e^+e^-\to$强子碰撞中重喷流质量的梳理。首先,我们计算了首阶的解析截面。其次,利用前导阶的结果和次-次-前导阶的数值结果,我们证明了前导阶相空间内部分布中的尖点在高阶时被软化。最后,使用分析和数值计算结果,我们表明,条款违反了梳理射流质量的因式分解定理的假设是数值上远小于预期的功率计数。这些结果提供了重要的信息,关于收敛的扰动理论疏导喷流观测值和可靠的估计,在精密计算的残余不确定性。

英文摘要:

Jet grooming has emerged as a necessary and powerful tool in a precision jet physics program. In this paper, we present three results on jet grooming in perturbation theory, focusing on heavy jet mass in $e^+e^-\to$ hadrons collisions, groomed with the modified mass drop tagger. First, we calculate the analytic cross section at leading-order. Second, using the leading-order result and numerical results through next-to-next-to-leading order, we show that cusps in the distribution on the interior of phase space at leading-order are softened at higher orders. Finally, using analytic and numerical results, we show that terms that violate the assumptions of the factorization theorem for groomed jet mass are numerically much smaller than expected from power counting. These results provide important information regarding the convergence of perturbation theory for groomed jet observables and reliable estimates for residual uncertainties in a precision calculation.

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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