Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T08: Flavour Physics and CP Violation
New physics analysis of some $b-$baryon decays
H. C p* and B. Mawlong
Full text: pdf
Pre-published on: January 12, 2022
Published on: May 12, 2022
Abstract
Measurements in the $b \to c {\tau}^- \bar{\nu}_{\tau}$ transitions suggest violation of lepton flavor universality (LFU). Assuming the flavor anomalies are due to new physics (NP) beyond the Standard Model (SM), we analyse the semileptonic decays of some heavy $b$-baryons to $c$-baryons, $\Sigma_b \to \Sigma_c {\tau}^- \bar{\nu}_{\tau}$ and $\Sigma_b \to \Sigma_{c}^* {\tau}^- \bar{\nu}_{\tau}$, which are mediated by $b \rightarrow c \tau^- \bar{\nu}_{\tau}$ transitions. Using a general effective Hamiltonian which includes both SM and NP contributions, we study and discuss the effects of the new contributions on the semileptonic $q^2$ spectra, such as the differential decay rate, ratio of branching fractions, forward-backward asymmetry of the charged lepton, convexity parameter and longitudinal polarization of the charged lepton in various new physics scenarios.
DOI: https://doi.org/10.22323/1.398.0505
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