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arXiv 1010.4485hep-phhep-ex
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Yukawa耦合和μ子的反常磁矩:LHC时代的更新

Yukawa coupling and anomalous magnetic moment of the muon: an update for the LHC era

Andreas Crivellin, Jennifer Girrbach, Ulrich Nierste

摘要:

研究了最小超对称标准模型(MSSM)三线性A项辐射产生的软μ子汤川耦合与μ子反常磁矩之间的相互作用.在不存在树能级μ介子Yukawa耦合的情况下,如果双质量M_1低于1TeV,则最轻的晕子质量在2 σ处的范围在750 GeV和2700 GeV之间。因此,在大型强子对撞机上探测到一个斯迈子(连同一个亚TeV的双星)将直接意味着MSSM超势中的一个非零μ子汤川耦合。包含slepton风味混合原则上可以降低一个smoon类slepton的质量低于750 GeV。然而,辐射轻子衰变的实验边界反而加强了低质量边界,对较小的M_1有较大的影响。我们还将分析扩展到电子的情况,发现接近目前实验搜索极限的轻选择子可以证明MSSM电子Yukawa耦合是非零的。

英文摘要:

We study the interplay between a soft muon Yukawa coupling generated radiatively with the trilinear A-terms of the minimal supersymmetric standard model (MSSM) and the anomalous magnetic moment of the muon. In the absence of a tree-level muon Yukawa coupling the lightest smuon mass is predicted to be in the range between 750 GeV and 2700 GeV at 2 sigma, if the bino mass M_1 is below 1 TeV. Therefore, a detection of a smuon (in conjunction with a sub-TeV bino) at the LHC would directly imply a non-zero muon Yukawa coupling in the MSSM superpotential. Inclusion of slepton flavor mixing could in principle lower the mass of one smuon-like slepton below 750 GeV. However, the experimental bounds on radiative lepton decays instead strengthen the lower mass bound, with larger effects for smaller M_1, We also extend the analysis to the electron case and find that a light selectron close to the current experimental search limit may prove the MSSM electron Yukawa coupling to be non-zero.

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