Speaker
Description
The experimental measurements of the LFU ratios $R_{D^{(*)}}$, $R_{K^{(*)}}$ and $R_{J/\psi}$ strongly hint the presence of new physics beyond the standard model in $b\rightarrow c\ell\nu_\ell$ and $b\rightarrow s\ell\ell$ transitions, as these values show a tension of about $(2-3)\sigma$ from their standard model predictions. In this work, we investigate the possible manifestation of new physics in $b \rightarrow u \ell \nu_\ell$ transitions and its effects on various semileptonic $q^2$-spectra. In particular, we analyse the decay modes $B^{+}\rightarrow \eta^{(\prime)}\ell^+\nu_\ell$, within a standard model effective field theory approach. We use the available experimental data on various leptonic and semileptonic decays to constrain the parameter space of the relevant new physics couplings.
| Session | Beyond the Standard Model |
|---|
