19–23 Dec 2024
Swatantrata Bhavan, Banaras Hindu University, Varanasi
Asia/Kolkata timezone

Unveiling the role of new physics in lepton flavor violating decays $b \rightarrow s \ell_1 \ell_2$ through model independent analysis

Not scheduled
20m
Swatantrata Bhavan, Banaras Hindu University, Varanasi

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Department of Physics, I.Sc., Banaras Hindu University, 221005 Varanasi, India
Oral Quark and lepton flavour physics

Speaker

Aishwarya Bhatta

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

Author

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