Speaker
Description
Driven by the recent anomalies observed in various measurements related to flavor-changing neutral current (FCNC) transitions like $ b \rightarrow s \ell^+ \ell^- $, we conduct a thorough examination of lepton flavor-violating (LFV) decay modes through $ b \rightarrow s \ell_1 \ell_2 $ transitions (where $ \ell_1 \neq \ell_2 $). While LFV transitions are not permitted in the Standard Model, they can naturally arise in many extensions of the model, such as those featuring additional vector-like fermions or extra $Z^ \prime $ bosons. Although LFV has been extensively investigated in mesonic decays, similar baryonic decays that involve the same quark-level transitions have largely been overlooked. By considering the most general effective Hamiltonian for $ b \rightarrow s \ell_1 \ell_2$ transitions—which includes vector, axial-vector, scalar, and pseudo-scalar operators—we derive the angular decay distribution for these processes. Taking a model-independent approach, we explore LFV decay modes such as $ B \rightarrow K^* \ell_1 \ell_2 $, $ B \rightarrow \phi \ell_1 \ell_2 $, $ B \rightarrow K_2^* \ell_1 \ell_2 $, and $ \Lambda_b \rightarrow \Lambda \ell_1 \ell_2$. In particular, we establish bounds on the branching ratios and analyze the parameters related to leptonic forward-backward asymmetry.
Field of contribution | Phenomenology |
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