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arXiv 1902.04593hep-ph
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重标量通过类矢量夸克与SM耦合的有效理论

Effective Theory for a Heavy Scalar Coupled to the SM via Vector-Like Quarks

Stefan Alte, Matthias Koenig, Matthias Neubert

摘要:

我们说明了最近开发的SCET $_{\rm BSM}$框架的应用程序在一个特定的模型,其中标准模型(SM)的补充重标量$S$和三代重,矢量夸克$Ψ$。我们构造了$S$到SM粒子的二体衰变的有效场论。我们显式计算威尔逊系数的SCET $_{\rm BSM}$运营商出现在领先和下一个领先的顺序(NLO)在$v/M_S$的权力的扩展,以及为运营商的子集产生在NNLO,保留充分的依赖于比率$M_S/M_Ψ$。对于重标量的唯象最相关的衰变通道,我们研究了Sudakov粒子的再膨胀效应对衰变率的影响。

英文摘要:

We illustrate the application of the recently developed SCET$_{\rm BSM}$ framework in the context of a specific model, in which the Standard Model (SM) is supplemented by a heavy scalar $S$ and three generations of heavy, vector-like quarks $Ψ$. We construct the appropriate effective field theory for two-body decays of $S$ into SM particles. We explicitly compute the Wilson coefficients of the SCET$_{\rm BSM}$ operators appearing at leading and next-to-leading order (NLO) in an expansion in powers of $v/M_S$, as well as for a subset of operators arising at NNLO, retaining the full dependence on the ratio $M_S/M_Ψ$. For the phenomenologically most relevant decay channels of the heavy scalar, we study the impact of resummation effects of Sudakov logarithms on the decay rates.

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