Speaker
Description
Scenario with a lepton-flavor-violating (LFV) interaction, either due to LFV coupling of a scalar or a vector boson, is an intriguing BSM phenomenon. This LFV coupling in the presence of muons leads to a rich phenomenology including an extra contribution to muon anomalous magnetic moment. With the low-energy effective coupling ${\cal L}_{\phi e\mu}=\phi\bar e(g_{e\mu}+h_{e\mu}\gamma^5)\mu$+h.c., which turns $e$ into $\mu$ or vice versa through a scalar $\phi$, we first derive $(h_{e\mu},M_\phi)$ parameter space that can account for experimental measurements of ${g_\mu}-2$. We propose to probe such parameter space or that with an even smaller $h_{e\mu}$ by searching for background-free processes of same-sign, same-flavor final-state lepton pairs $e^+e^-\to e^\pm\mu^\mp\phi\to e^\pm e^\pm\mu^\mp\mu^\mp$ at Belle II. Assuming such final states are detected by Belle II, we propose an effective method to further discriminate between scalar and vector boson mediated LFV interaction scenario.
| Alternate track | 05. Quark and Lepton Flavour Physics |
|---|---|
| I read the instructions above | Yes |
