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arXiv 2005.10221hep-phhep-ex
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对LHC上壳层Z产生的混合QCD-电弱修正

Mixed QCD-electroweak corrections to on-shell Z production at the LHC

Federico Buccioni, Fabrizio Caola, Maximilian Delto, Matthieu Jaquier, Kirill Melnikov, Raoul Röntsch

摘要:

我们首次完整计算了强子碰撞中壳层上$Z$玻色子的产生及其衰变为无质量带电轻子的混合QCD-电弱修正。我们的计算是完全差分的最终状态QCD部分子和解决的光子,使我们能够计算任何红外安全的可观测的$pp \to Z \to l^+ l^-$过程中的近似,$Z$玻色子是壳。虽然混合的QCD-电弱修正很小,大约在每密尔水平,我们观察到QCD-QED和QCD-弱贡献之间的相互作用是微妙的和可观测的依赖。因此,如果需要${\cal O}(α_{EW} α_s)$精度,则不可能避免计算一个或另一个。

英文摘要:

We present the first complete calculation of mixed QCD-electroweak corrections to the production of on-shell $Z$ bosons in hadron collisions and their decays to massless charged leptons. Our computation is fully differential with respect to final state QCD partons and resolved photons, allowing us to compute any infra-red safe observable pertinent to the $pp \to Z \to l^+ l^-$ process in the approximation that the $Z$ boson is on shell. Although mixed QCD-electroweak corrections are small, at about the per mill level, we observe that the interplay between QCD-QED and QCD-weak contributions is subtle and observable-dependent. It is therefore not possible to avoid computing one or the other if ${\cal O}(α_{EW} α_s)$ precision is desired.

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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