Neutral kaon mixing beyond the Standard Model with n f = 2 + 1 chiral fermions. Part 2: non perturbative renormalisation of the ?F = 2 four-quark operators
Neutral kaon mixing beyond the Standard Model with n f = 2 + 1 chiral fermions. Part 2: non perturbative renormalisation of the ?F = 2 four-quark operators
复制标题
中性 kaon 混合超出 n f = 2 1 手性费米子的标准模型。
DOI：
10.1007/jhep10(2017)054
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发表时间：
2017
影响因子：
5.4
通讯作者：
Boyle P
中科院分区：
文献类型：
--
作者：
Boyle P
本文计算了超标准模型（Beyond the Standard Model，BSM）K介子混合所需的ΔF= 2四夸克算符的重整化因子（Z矩阵）。我们的工作与N F= 2+ 1口味的畴壁费米子的手征味属性是必不可少的，以保持一个连续的混合模式。我们引入了新的RI-Sirrhenormalisation计划，我们认为是更好的表现相比，常用的相应的RI-Sirrhone。我们发现，一旦转换为，Z-因子计算通过这些RI-S计划是在良好的协议，但显着不同的计算通过RI-S计划。本文所提出的RI-S-Z因子已在文献[1]中用于计算BSM中性K介子混合矩阵元。我们认为，重整程序是负责不同的合作观察到的差异，我们将调查和阐明这些差异的起源在整个这项工作。
We compute the renormalisation factors (Z-matrices) of the ΔF= 2 four-quark operators needed for Beyond the Standard Model (BSM) kaon mixing. We work with n f= 2+ 1 flavours of Domain-Wall fermions whose chiral-flavour properties are essential to maintain a continuum-like mixing pattern. We introduce new RI-SMOM renormalisation schemes, which we argue are better behaved compared to the commonly-used corresponding RI-MOM one. We find that, once converted to, the Z-factors computed through these RI-SMOM schemes are in good agreement but differ significantly from the ones computed through the RI-MOM scheme. The RI-SMOM Z-factors presented here have been used to compute the BSM neutral kaon mixing matrix elements in the companion paper [1]. We argue that the renormalisation procedure is responsible for the discrepancies observed by different collaborations, we will investigate and elucidate the origin of these differences throughout this work.