Schönherr Marek
Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland.
Eur Phys J C Part Fields. 2018;78(2):119. doi: 10.1140/epjc/s10052-018-5600-z. Epub 2018 Feb 9.
In this paper a generalisation of the Catani-Seymour dipole subtraction method to next-to-leading order electroweak calculations is presented. All singularities due to photon and gluon radiation off both massless and massive partons in the presence of both massless and massive spectators are accounted for. Particular attention is paid to the simultaneous subtraction of singularities of both QCD and electroweak origin which are present in the next-to-leading order corrections to processes with more than one perturbative order contributing at Born level. Similarly, embedding non-dipole-like photon splittings in the dipole subtraction scheme discussed. The implementation of the formulated subtraction scheme in the framework of the Sherpa Monte-Carlo event generator, including the restriction of the dipole phase space through the -parameters and expanding its existing subtraction for NLO QCD calculations, is detailed and numerous internal consistency checks validating the obtained results are presented.
本文提出了一种将卡塔尼 - 西摩偶极子减法方法推广到次领头阶电弱计算的方法。考虑了在无质量和有质量旁观者存在的情况下，无质量和有质量部分子发射光子和胶子辐射产生的所有奇点。特别关注同时减去 QCD 和电弱起源的奇点，这些奇点出现在对具有多个微扰阶次贡献于 Born 水平的过程的次领头阶修正中。类似地，讨论了在偶极子减法方案中嵌入非偶极子类光子分裂。详细介绍了在 Sherpa 蒙特卡罗事件发生器框架中所制定减法方案的实现，包括通过 - 参数限制偶极子相空间以及扩展其现有的 NLO QCD 计算减法，并给出了大量验证所得结果的内部一致性检验。
