Speaker
Description
Driven by the persistent anomalies observed in the $ b \to (u, c) \tau \bar{\nu}_\tau $ decays, we investigate these transitions within the framework of effective field theory, incorporating possible contributions from light right-handed neutrinos. By performing a global fit to the available experimental data, including measurements of $ R_{D^{(*)}} $, $R_{J/\psi} $, $ R_{\pi} $, $P_{\tau}^{D^*}$ the branching ratio for $B_c \to \tau \bar{\nu}_\tau $, and $B \to \pi \tau \bar{\nu}_\tau $, we determine the allowed ranges for the Wilson coefficients associated with various new physics scenarios. We then explore the impact of the constrained new parameters, specifically those arising from light right-handed neutrinos, on the semileptonic decay $\Upsilon(1S) \to B_{(c)} \tau \bar{\nu}_\tau $. Furthermore, we examine the existence of lepton non-universality in these decay modes.
| Field of contribution | Phenomenology |
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