arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.6261hep-ph
收藏

NLO分裂函数PDKEEPAAB奇异性的新PV公式

The new PV prescription for IR singularities of NLO splitting functions

M. Skrzypek, O. Gituliar, S. Jadach, A. Kusina

摘要:

在本说明中,我们概述了蒙特卡罗项目{ \tt KrkMC}。本项目的目标是构造一个在系数函数和分裂函数(簇射)部分都精确到NLO水平的QCD Parton簇射。我们详细讨论了它的一个方面-进化核。核必须在一个新的正则化方案中重新计算,称为NPV。在这个方案中,积分动量的正分量中的所有奇点都通过主值处方正则化。这与标准方法相反,在标准方法中,只有虚假的轴向奇点通过主值正则化。结果,维度正则化参数$ε$中的三极点被$ε$极点和几何截止点$δ$的极点的组合替换。由此产生的排他性的部分子密度更适合于随机应用在四维。与此同时,在包容性层面,标准和新的处方给出了相同的结果,只要增加适当的实际和虚拟贡献。

英文摘要:

In this note we outline the Monte Carlo project {\tt KrkMC}. The goal of this project is to construct a QCD Parton Shower accurate to NLO level in both coefficient function and splitting function (shower) parts. We discuss in detail one of its aspects --- the evolution kernels. The kernels had to be recalculated in a new regularisation scheme, called NPV. In this scheme all the singularities in the plus component of the integration momenta are regularised by means of principal value prescription. This is in contrast to the standard approach, in which only the spurious axial singularities are regularised by principal value. As a result, the triple poles in the dimensional regularisation parameter $ε$ are replaced by a combination of $ε$-poles and logarithms of geometrical cut-off $δ$. The resulting exclusive parton densities are more suitable for stochastic applications in four dimensions. Simultaneously, at the inclusive level, the standard and new prescriptions give the same results provided appropriate real and virtual contributions are added.

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。

↑