L μ − L τ theory of Higgs flavor violation and ð g − 2 Þ μ
L μ − L τ theory of Higgs flavor violation and ð g − 2 Þ μ
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发表时间：
2016
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通讯作者：
W. Altmannshofer;M. Carena
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作者：
W. Altmannshofer;M. Carena
一些实验报道了在涉及μ子的过程中轻子风味或轻子风味普适性的违反。最显著的是，在大型强子对撞机中存在违反希格斯衰变h→τμ的色子的非零速率，以及在大型强子对撞机中罕见的B介子衰变中存在违反轻子色子普适性的提示。此外，长期存在的μ子异常磁矩差异也激发了与μ子相关的新物理学。一个违反轻子味普适性的对称是L μ−L τ: μ子数与τ数之差。我们证明了在L μ−L τ理论中加入类矢量费米子会自然地对μ子和h→τμ的反常磁矩产生影响，而其他τ→μ跃迁的影响则被对称性参数系统地抑制了。我们发现，如果测量L μ−L τ，在预测τ→3 μ和修正的h→μ速率的同时，也可以适应b→s μμ数据的差异。
Several experiments reported hints for the violation of lepton flavor or lepton flavor universality in processes involving muons. Most prominently, there is the hint for a nonzero rate of the flavor violating Higgs decay h → τμ at the LHC, as well as the hint for lepton flavor universality violation in rare B meson decays at the LHCb. In addition, also the long-standing discrepancy in the anomalous magnetic moment of the muon motivates new physics connected to muons. A symmetry which violates lepton flavor universality is L μ − L τ : the difference of muon number and tau number. We show that adding vectorlike fermions to a L μ − L τ theory generates naturally an effect in the anomalous magnetic moment of the muon and h → τμ , while effects in other τ → μ transitions are systematically suppressed by symmetry arguments. We find that if L μ − L τ is gauged it is possible to also accommodate the discrepant b → s μμ data while predicting a τ → 3 μ and a modified h → μμ rate within reach of upcoming experiments.