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arXiv 2006.03056hep-phnucl-th
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在N3LO的N-喷射梁函数

N-jettiness beam functions at N3LO

Markus Ebert, Bernhard Mistlberger, Gherardo Vita

摘要:

本文首次完整地计算了微扰QCD中次-主导阶(N $^3$ LO)夸克和胶子$N$ -jettiness($\Tau_N$)光束函数。我们的计算是基于微分希格斯玻色子和Drell-Yan产生截面关于它们的共线极限的展开。这种方法使我们能够采用尖端技术来计算截面,以提取所讨论的通用构建块。出现在所有通道的匹配系数中的函数类包括具有非有理核的迭代积分,从而超出了调和多项式的范围。我们的结果是将$\Tau_N$减法推广到$^3$ LO的关键一步,并在NPDMATHABMO LL $^\prime$精度下恢复夸克和胶子引发过程的$\Tau_N$分布。

英文摘要:

We present the first complete calculation for the quark and gluon $N$-jettiness ($\Tau_N$) beam functions at next-to-next-to-next-to-leading order (N$^3$LO) in perturbative QCD. Our calculation is based on an expansion of the differential Higgs boson and Drell-Yan production cross sections about their collinear limit. This method allows us to employ cutting edge techniques for the computation of cross sections to extract the universal building blocks in question. The class of functions appearing in the matching coefficents for all channels includes iterated integrals with non-rational kernels, thus going beyond the one of harmonic polylogarithms. Our results are a key step in extending the $\Tau_N$ subtraction methods to N$^3$LO, and to resum $\Tau_N$ distributions at N$^3$LL$^\prime$ accuracy both for quark as well as for gluon initiated processes.

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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