Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA.
Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett. 2018 Jun 1;120(22):221804. doi: 10.1103/PhysRevLett.120.221804.
Many new physics scenarios beyond standard model often necessitate the existence of a (light) neutral scalar H, which might couple to the charged leptons in a flavor violating way, while evading all existing constraints. We show that such scalars could be effectively produced at future lepton colliders, either on shell or off shell depending on their mass, and induce lepton flavor violating (LFV) signals, i.e., e^{+}e^{-}→ℓ_{α}^{±}ℓ_{β}^{∓}(+H) with α≠β. We find that a large parameter space of the scalar mass and the LFV couplings can be probed well beyond the current low-energy constraints in the lepton sector. In particular, a scalar-loop induced explanation of the long-standing muon g-2 anomaly can be directly tested in the on-shell mode.
许多超越标准模型的新物理场景通常需要存在一个（轻）中性标量 H，它可能以破坏味道的方式与带电轻子耦合，同时逃避所有现有的限制。我们表明，这种标量可以在未来的电子对撞机中有效地产生，无论是在壳还是脱壳，这取决于它们的质量，并诱导轻子味道破坏（LFV）信号，即 e^{+}e^{-}→ℓ_{α}^{±}ℓ_{β}^{∓}(+H)，其中 α≠β。我们发现，在轻子部门，当前低能限制之外的标量质量和 LFV 耦合的很大参数空间可以很好地探测到。特别是，在壳模式下可以直接测试标量环诱导的长期存在的μ子 g-2 异常的解释。
