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arXiv 1702.00348hep-ph
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夸克味破坏MSSM中全单圈水平的胶子二体衰变

Two-body decays of gluino at full one-loop level in the quark-flavour violating MSSM

Helmut Eberl, Elena Ginina, Keisho Hidaka

摘要:

本文在夸克扇区中具有夸克味破坏的最小超对称标准模型中,研究了全单圈水平下的胶子二体衰变。在$\overline{\rm DR}$方案中进行重整化。胶子辐射和光子辐射是通过增加相应的三体衰变宽度来计算的。讨论了QFV参数对胶子衰变宽度的影响。主要的依赖性来自于衰变中的$\tilde c_R - \tilde t_R$混合到上型夸克,以及衰变中的$\tilde s_R - \tilde b_R$混合到下型夸克,这是由于B物理对其他夸克味混合参数的强烈约束。对胶子衰变宽度的完整单圈修正大部分是负的,约为-10\%。QFV部分在总宽度上保持较小,但在最轻的squark中衰减宽度的变化可达-8\%。对于相应的分支比,该效应在某种程度上被至少两倍的因子消除。电弱修正可以达到SUSY QCD修正的35%.

英文摘要:

We study the two-body decays of the gluino at full one-loop level in the Minimal Supersymmetric Standard Model with quark-flavour violation (QFV) in the squark sector. The renormalization is done in the $\overline{\rm DR}$ scheme. The gluon and photon radiations are included by adding the corresponding three-body decay widths. We discuss the dependence of the gluino decay widths on the QFV parameters. The main dependence stems from the $\tilde c_R - \tilde t_R$ mixing in the decays to up-type squarks, and from the $\tilde s_R - \tilde b_R$ mixing in the decays to down-type squarks due to the strong constraints from B-physics on the other quark-flavour mixing parameters. The full one-loop corrections to the gluino decay widths are mostly negative and of the order of about -10\%. The QFV part stays small in the total width but can vary up to -8\% for the decay width into the lightest squark. For the corresponding branching ratio the effect is somehow washed out by at least a factor of two. The electroweak corrections can be as large as 35\% of the SUSY QCD corrections.

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