Approximate N3LO Higgs-boson production cross section using physical-kernel constraints
Approximate N3LO Higgs-boson production cross section using physical-kernel constraints
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DOI：
10.1007/jhep10(2014)176
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发表时间：
2014-08
影响因子：
5.4
通讯作者：
D. Florian;J. Mazzitelli;S. Moch;A. Vogt
中科院分区：
文献类型：
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作者：
D. Florian;J. Mazzitelli;S. Moch;A. Vogt
利用重顶夸克极限下胶子-胶子融合产生Higgs的物理核的单对数增强，导出了在阈值展开中对N3LO系数函数的主要未知贡献ln5，4，3(1−z).同时利用希格斯交换分布函数估计z=m2H/ŝ→1的剩余项，这些结果与最近完成的软+虚拟贡献相结合，为完整的N3LO校正提供了一个不确定带。对于2008年MSTW部分子分布，这些N3LO贡献使重整化标度的标准选择μR=mH和μR=mH/2的14TeV截面增加了(10±2)%和(3±2.5)%。由硬散射截面引起的剩余不确定度可以量化为不超过5%，这比由于强耦合和部分子分布引起的不确定度小。
The single-logarithmic enhancement of the physical kernel for Higgs production by gluon-gluon fusion in the heavy top-quark limit is employed to derive the leading so far unknown contributions, ln 5, 4, 3 (1− z), to the N 3 LO coefficient function in the threshold expansion. Also using knowledge from Higgs-exchange DIS to estimate the remaining terms not vanishing for z= m 2 H/ŝ→ 1, these results are combined with the recently completed soft+ virtual contributions to provide an uncertainty band for the complete N 3 LO correction. For the 2008 MSTW parton distributions these N 3 LO contributions increase the cross section at 14 TeV by (10±2)% and (3±2. 5)% for the standard choices μ R= m H and μ R= m H/2 of the renormalization scale. The remaining uncertainty arising from the hard-scattering cross sections can be quantified as no more than 5%, which is smaller than that due to the strong coupling and the parton distributions.