使用${\cal KK}$ MC-hh对Z/ $γ^*$ Drell-Yan观测量的IFI和ISR效应
IFI and ISR Effects for Z/$γ^*$ Drell-Yan Observables using ${\cal KK}$MC-hh
摘要：
在LHC精密物理的背景下，我们继续研究衰变到带电轻子对的重规范玻色子产生中多光子辐射效应的预期大小，使用\KK{MC} -hh 4.22，我们考虑了ATLAS和CMS合作测量的特定Z/ $γ^*$ Drell-Yan观测值的IFI和ISR效应。用这个版本的\KK{MC}，我们在强子MC中得到了相干排他取幂（CEEX）电弱（EW）精确${\cal O}(α^2 L)$修正，并控制了相应的EW初末干涉（IFI）效应。具体来说，我们说明了削减的类型之间的相互作用，用于测量$A_{FB}$和$A_4$在大型强子对撞机和伴随的高阶校正的预期响应的大小。我们发现，在初始态辐射中存在百分之一至千分之一级的效应，在IFI中存在部分千分之一级的效应，在总的${\cal O}(α^2 L)$修正中存在千分之一级的效应，这些都是在千分之一级处理EW修正时应该考虑的。我们的结果适用于当前的LHC实验数据分析。
英文摘要：
Continuing with our investigations of the expected sizes of multiple photon radiative effects in heavy gauge boson production with decay to charged lepton pairs in the context of the precision physics of the LHC, using \KK{MC}-hh 4.22 we consider IFI and ISR effects for specific Z/$γ^*$ Drell-Yan observables measured by the ATLAS and CMS Collaborations. With this version of \KK{MC}-hh, we have coherent exclusive exponentiation (CEEX) electroweak (EW) exact ${\cal O}(α^2 L)$ corrections in a hadronic MC and control over the corresponding EW initial-final interference (IFI) effects as well. Specifically, we illustrate the interplay between cuts of the type used in the measurement of $A_{FB}$ and $A_4$ at the LHC and the sizes of the expected responses of the attendant higher order corrections. We find that there are per cent to per mille level effects in the initial-state radiation, fractional per mille level effects in the IFI and per mille level effects in the over-all ${\cal O}(α^2 L)$ corrections that any treatment of EW corrections at the per mille level should consider. Our results are applicable to current LHC experimental data analyses.
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