论文标题
在LHC处的O（N_Fα_Sα）的o（n_fα_sα）的混合NNLO QCD X electroweak校正
Mixed NNLO QCD x electroweak corrections of O(N_f α_s α) to single-W/Z production at the LHC
论文作者
论文摘要
在LHC处提出了o（n_fα_Sα）辐射校正（N_Fα_Sα）的辐射校正的第一个结果，其中N_F是Fermion风味的数量。这些校正包含具有封闭费用环的O（α_Sα）处的所有图表，形成了混合QCD X Electroweak类型的近隔到领导级校正的量规不变的一部分，并且是涉及W和Z共振的质量重新分配的问题。仅涉及自我能量插入的不可约的两环图，用当前的标准技术计算出对e（α_Sα）的electroweak仪表孔自我增强的明确分析结果。此外，描述了o（α_Sα）阶的量表不变处理的复杂质量方案的概括。虽然在蒙特卡洛计划辐射中实施的校正对于以谐振w/z玻色子为主的可观察物可以忽略不计，但它们影响不变质量分布的水平高达2％的不变质量> 500 GEV，因此与现象学相关。考虑到对这些分布的领先预测低估了频谱的前阶预测，对横向摩托明群分布的影响相似。
First results on the radiative corrections of order O(N_fα_sα) are presented for the off-shell production of W or Z bosons at the LHC, where N_f is the number of fermion flavours. These corrections comprise all diagrams at O(α_sα) with closed fermion loops, form a gauge-invariant part of the next-to-next-to-leading-order corrections of mixed QCD x electroweak type, and are the ones that concern the issue of mass renormalization of the W and Z resonances. The occurring irreducible two-loop diagrams, which involve only self-energy insertions, are calculated with current standard techniques, and explicit analytical results on the electroweak gauge-boson self-energies at O(α_sα) are given. Moreover, the generalization of the complex-mass scheme for a gauge-invariant treatment of the W/Z resonances is described for the order O(α_sα). While the corrections, which are implemented in the Monte Carlo program RADY, are negligible for observables that are dominated by resonant W/Z bosons, they affect invariant-mass distributions at the level of up to 2% for invariant masses of >500 GeV and are, thus, phenomenologically relevant. The impact on transverse-momentum distributions is similar, taking into account that leading-order predictions to those distributions underestimate the spectrum.
