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arXiv 0907.1560hep-ph
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标准模型超对称扩展B-L中的轻子味破坏

Lepton flavor violation in supersymmetric B-L extension of the standard model

Shaaban Khalil

摘要:

标准模型的超对称B-L扩展是超越标准模型的最佳候选物理之一,它解释了TeV尺度的跷跷板机制,并为Higgs自然性问题提供了一个有吸引力的解决方案。我们分析了这类模型中的带电轻子味破坏。结果表明,由于Dirac中微子Yukawa耦合很小,由软超对称性破缺项从大统一理论到跷跷板尺度的重整化群演化所产生的lj-> lj γ和lj-> 3lj衰变率受到很大的抑制.因此,该模型是免费的严格LFV约束通常施加在超对称跷跷板模型。我们还证明了右超中微子是一种长寿命粒子,可以通过B-L规范玻色子在LHC中成对产生。然后衰变为同号双轻子,总截面为O(1)pb。该信号是SM的超对称B-L扩张的显著特征之一。

英文摘要:

Supersymmetric B-L extension of the Standard Model (SM) is one of the best candidate for physics beyond the SM that accounts for TeV scale seesaw mechanism and provides an attractive solution for the Higgs naturalness problem. We analyze the charged lepton flavor violation (LFV) in this class of models. We show that due to the smallness of Dirac neutrino Yukawa coupling, the decay rates of l_i -> l_j gamma and l_i -> 3 l_j, generated by the renormalization group evolution of soft SUSY breaking terms from GUT to seesaw scale, are quite suppressed. Therefore, this model is free from the stringent LFV constraints usually imposed on the supersymmetric seesaw model. We also demonstrate that the right-sneutrino is a long-lived particle and can be pair produced at the LHC through the B-L gauge boson. Then, they decay into same-sign dilepton, with a total cross section of order O(1) pb. This signal is one of the striking signatures of supersymmetric B-L extension of the SM.

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