Probing new physics in semileptonic $\Sigma_b$ and $\Omega_b$ decays

TL;DR

This paper investigates potential new physics effects in semileptonic baryon decays ${ m oldsymbol{ extSigma_b} o extSigma_c l ar{ u_{l}}}$ and ${ m oldsymbol{ extOmega_b} o extOmega_c l ar{ u_{l}}}$, motivated by recent anomalies in B meson decays, using model-independent analysis constrained by existing measurements.

Contribution

It provides a comprehensive, model-independent analysis of baryon decays to probe new physics, constrained by B decay anomalies, and predicts various observables for future experimental tests.

Findings

Constraints on new physics couplings from B decay data.

Predictions for branching ratios and asymmetries in baryon decays.

Identification of observable signatures of new physics in future experiments.

Abstract

Recently, several hints of lepton non-universality have been observed in the semileptonic B meson decays in terms of both in the neutral current ($b\to s l \bar{l}$) and charged current ($b\to c l \bar{\nu_{l}}$) transitions. Motivated by these inspiring results, we perform the analysis of the baryon decays ${\Sigma_b}\to \Sigma_c l \bar{\nu_{l}}$ and $\Omega_b\to \Omega_c l \bar{\nu_{l}} (l=e,\mu,\tau)$ which are mediated by $ b \to c l \bar{\nu_{l}}$ transitions at the quark level, to scrutinize the nature of new physics (NP) in the model independent method. We first use the experimental measurements of $\mathcal{B}( B\to D^{(*)} l\bar{\nu_{l}})$, ${\rm R}_{D^{(*)}}$ and ${\rm R}_{J/\psi}$ to constrain the NP coupling parameters in a variety of scenarios. Using the constrained NP coupling parameters, we report numerical results on various observables related to the processes ${\Sigma_b}\to \Sigma_c l \bar{\nu_{l}}$ and $\Omega_b\to \Omega_c l \bar{\nu_{l}}$, such as the branching ratios, the ratio of branching fractions, the lepton side forward-backward asymmetries, the hadron and lepton longitudinal polarization asymmetries and the convexity parameter. We also provide the $q^2$ dependency of these observables and we hope that the corresponding numerical results in this work will be testified by future experiments.