论文标题
MCFM中NNLO QCD的非本地切片方法
Non-local slicing approaches for NNLO QCD in MCFM
论文作者
论文摘要
我们介绍了Parton级Monte Carlo计划MCFM中QCD中近临时到领先顺序（NNLO）精度的几个过程的实现。所处理的过程为$ pp \ to h $，$ w^\ pm $，$ z $，$ w^\ pm h $，$ zh $，$ w^\pmγ$，$zγ$和$γγ$，并且在代码中的第一次，$ w^+w^+w^ - $ w^ - $ w^\ pm z $和$ z $和$ zz $。完全包括了不稳定玻色子的腐烂，从而产生了灵活的完全不同的蒙特卡洛代码。已经使用两种非本地切片方法计算了NNLO校正，通过切割零杰特斯（$ {\ cal t} _0 $或$ q_T $，$ {\ cal t} $（$ q_t $），隔离双重分辨的区域，即颜色单元最终状态粒子的横向动量。我们发现，对于大多数但并非所有处理，$ q_t $切片方法都会导致较小的功率校正，以达到同等的计算负担。
We present the implementation of several processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD in the parton-level Monte Carlo program MCFM. The processes treated are $pp\to H$, $W^\pm$, $Z$, $W^\pm H$, $ZH$, $W^\pmγ$, $Zγ$ and $γγ$ and, for the first time in the code, $W^+W^-$, $W^\pm Z$ and $ZZ$. Decays of the unstable bosons are fully included, resulting in a flexible fully differential Monte Carlo code. The NNLO corrections have been calculated using two non-local slicing approaches, isolating the doubly unresolved region by cutting on the zero-jettiness, ${\cal T}_0$, or on $q_T$, the transverse momentum of the colour singlet final-state particles. We find that for most, but not all processes the $q_T$ slicing method leads to smaller power corrections for equal computational burden.
