Approximate four-loop QCD corrections to the Higgs-boson production cross section

Approximate four-loop QCD corrections to the Higgs-boson production cross section
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对希格斯玻色子产生截面的近似四环 QCD 校正

DOI:
10.1016/j.physletb.2020.135546
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发表时间:
2020
期刊:
影响因子:
4.4
通讯作者:
A. Vogt
A. Vogt
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
G. Das;S. Moch;A. Vogt

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我们研究了四圈胶子-胶子融合中软的和共线的对包含型希格斯-玻色子产生的贡献。利用分裂函数的夸克、胶子形状因子和Mellin矩的最新进展,我们能够在大量颜色的限制下准确地完成软胶子增强贡献,并对QCD达到足够精确的数值精度。对于重整化标度的标准选择μR=mH和μR=mH/2,四圈软贡献和虚贡献分别使14TeV的QCD截面增加了2.7%和0.2%,标度不确定度降低到±3%以下。作为副产品,我们导出了四圈胶子-胶子分裂函数的完整δ(1−x)项和五圈胶子分裂函数的纯阿贝尔贡献项,并给出了四圈胶子形状因子单极的量纲正则化的数值结果。最后,我们给出了Higgs-玻色子和Drell-yan轻子对产生的软胶子指数化的密切相关的四阶系数D4。
We study the soft and collinear contributions to inclusive Higgs-boson production in gluon-gluon fusion at four loops. Using recent progress for the quark and gluon form factors and Mellin moments of splitting functions, we are able to complete the soft-gluon enhanced contributions exactly in the limit of a large number of colours, and to a sufficiently accurate numerical accuracy for QCD. The four-loop soft and virtual contributions increase the QCD cross section at 14 TeV by 2.7% and 0.2% for the standard choices μ R= m H and μ R= m H/2 of the renormalization scale, and reduce the scale uncertainty to below±3%. As by-products, we derive the complete δ (1− x) term for the gluon-gluon splitting function at four loops and its purely Abelian contributions at five loops, and provide a numerical result for the single pole of the four-loop gluon form factor in dimensional regularization. Finally we present the closely related fourth-order coefficients D 4 for the soft-gluon exponentiation of Higgs-boson and Drell-Yan lepton-pair production.
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