Exploring b → cτν mediated baryonic decay modes in SMEFT framework

¹ School of Physics
² University of Hyderabad
³ Telangana, India

^* e-mail: pandadhiren530@gmail.com
^** e-mail: rmsp@uohyd.ac.in

Published online: 20 November 2024

Abstract

Motivated by the interplay between the LEFT and SMEFT operators at the electroweak scale, we study the interrelation among the B decays mediated by b → cℓν_ℓ, b → sν_ℓν_ℓ and b → sℓℓ (ℓ = e, µ, τ) quark level transitions in the context of six-dimensional SMEFT operators such as $Q_{\ell q}^{(3)},Q_{\ell edq},Q_{\ell equ}^{(1)},Q_{\ell equ}^{(3)},\mathrm{a}\mathrm{n}\mathrm{d}{Q}_{\varphi q}^{(3)}$$${Q_{\ell q}^{(3)},\,{Q_{\ell edq}},\,Q_{\ell equ}^{(1)},\,Q_{\ell equ}^{(3)},\,{\rm{and}}\,Q_{\phi q}^{(3)}} $$. We constrain the new physics parameter space through a com-ℓequ ϕq prehensive global fit incorporating the observables R_D, R_D∗, P_τ(D^∗), F_L(D^∗), R_Λ, B(B₀ → K^∗νν), B(B → K⁺νν), B(B → K⁺τ⁺τ⁻) and B(B_s → τ⁺τ⁻). We then investigate the sensitivity of new physics in the semi-leptonic decay modes of b-baryons, specifically Ξ_b → Ξ_cτ⁻ ν¯_τ. We further explore the impact of the new physics couplings on several observables such as the differential branching ratio (DBR), forward-backward asymmetry ($A_{FB}^{\tau }$$${A_{FB}^\tau} $$) the lepton flavor non-universality ($R_{{\mathrm{\Xi }}_b}$$${R_{{\Xi _b}}} $$) for this processes.