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全单圈水平下两体部分衰变宽度的一般计算。

Generic calculation of two-body partial decay widths at the full one-loop level.

作者信息

Goodsell Mark D, Liebler Stefan, Staub Florian

机构信息

1Sorbonne Universités, UPMC Univ Paris 06, UMR 7589, LPTHE, 75005 Paris, France.

2CNRS, UMR 7589, LPTHE, 75005 Paris, France.

出版信息

Eur Phys J C Part Fields. 2017;77(11):758. doi: 10.1140/epjc/s10052-017-5259-x. Epub 2017 Nov 11.

DOI:10.1140/epjc/s10052-017-5259-x
PMID:31997930
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6956948/
Abstract

We describe a fully generic implementation of two-body partial decay widths at the full one-loop level in the SARAH and SPheno framework compatible with most supported models. It incorporates fermionic decays to a fermion and a scalar or a gauge boson as well as scalar decays into two fermions, two gauge bosons, two scalars or a scalar and a gauge boson. We present the relevant generic expressions for virtual and real corrections. Whereas wave-function corrections are determined from on-shell conditions, the parameters of the underlying model are by default renormalised in a (or ) scheme. However, the user can also define model-specific counter-terms. As an example we discuss the renormalisation of the electric charge in the Thomson limit for top-quark decays in the standard model. One-loop-induced decays are also supported. The framework additionally allows the addition of mass and mixing corrections induced at higher orders for the involved external states. We explain our procedure to cancel infrared divergences for such cases, which is achieved through an infrared counter-term taking into account corrected Goldstone boson vertices. We compare our results for sfermion, gluino and Higgs decays in the minimal supersymmetric standard model (MSSM) against the public codes SFOLD, FVSFOLD and HFOLD and explain observed differences. Radiatively induced gluino and neutralino decays are compared against the original implementation in SPheno in the MSSM. We exactly reproduce the results of the code CNNDecays for decays of neutralinos and charginos in -parity violating models. The new version SARAH 4.11.0 by default includes the calculation of two-body decay widths at the full one-loop level. Current limitations for certain model classes are described.

摘要

我们描述了在SARAH和SPheno框架中全一圈水平下两体部分衰变宽度的完全通用实现，该实现与大多数支持的模型兼容。它包括费米子衰变为一个费米子和一个标量或一个规范玻色子，以及标量衰变为两个费米子、两个规范玻色子、两个标量或一个标量和一个规范玻色子。我们给出了虚拟修正和实修正的相关通用表达式。波函数修正是根据壳上条件确定的，而基础模型的参数默认在一个（或）方案中进行重整化。然而，用户也可以定义特定于模型的抵消项。作为一个例子，我们讨论了标准模型中顶夸克衰变在汤姆逊极限下电荷的重整化。还支持一圈诱导衰变。该框架还允许添加对所涉及的外部态在高阶诱导的质量和混合修正。我们解释了在这种情况下消除红外发散的过程，这是通过考虑修正的戈德斯通玻色子顶点的红外抵消项来实现的。我们将最小超对称标准模型（MSSM）中sfermion、胶微子和希格斯衰变的结果与公共代码SFOLD、FVSFOLD和HFOLD进行比较，并解释观察到的差异。将辐射诱导的胶微子和中性子衰变与MSSM中SPheno的原始实现进行比较。我们精确地重现了代码CNNDecays在宇称破缺模型中中性子和带电粒子衰变的结果。新版本的SARAH 4.11.0默认包括全一圈水平下两体衰变宽度的计算。描述了某些模型类别的当前限制。

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