Analysis of $b\to c\ell \nu$ baryonic decay modes in SMEFT approach

Abstract

The flavor-changing neutral current decays of heavy bottom quark, alongside the flavor-changing charged current processes mediated by $b\to (c,u)$ in semileptonic $B$ decays are emerged as powerful tools for exploring physics beyond the Standard Model. In this work, we focus on the feasibility of interpreting the processes mediated by $b\to c\tau \nu$ transitions, in particular, the semileptonic $b$-baryonic decay modes ${\Sigma }_b\to {\Sigma }_c^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ and ${\Xi }_b\to {\Xi }_c{\tau }^{-}{\bar{\nu }}_{\tau }$ in the context of SMEFT approach. We perform a detailed analysis of the sensitivity of new physics operators on various observables such as branching ratio, forward-backward asymmetry parameter, lepton non-universal observable and the longitudinal polarization fraction of the $b$-baryonic decay channels.

Comments: 20 pages, 13 figures