A closer look at observables from exclusive semileptonic $B\to (\pi ,\rho )\ell {\nu }_{\ell }$ decays

Abstract

This article analyses the available inputs in $\btopilnu$ and $\btorholnu$ decays which include the measured values of differential rate in different $q^2$-bins (lepton invariant mass spectrum), lattice, and the newly available inputs on the relevant form-factors from the light-cone sum rules (LCSR) approach. We define different fit scenarios, and in each of these scenarios, we predict a few observables in the standard model (SM). For example, $R(M)=\frac{\mathcal{B}(B\to M{\ell }_i{\nu }_{{\ell }_i})}{\mathcal{B}(B\to M{\ell }_j{\nu }_{{\ell }_j})}$, $R_{{\ell }_j}^{{\ell }_i}(M)=\frac{\mathcal{B}(B\to {\ell }_i{\nu }_{{\ell }_i})}{\mathcal{B}(B\to M{\ell }_j{\nu }_{{\ell }_j})}$ with M = $\pi$ or $\rho$ and ${\ell }_{i,j}=e,\mu$ or $\tau$. We also discuss the new physics (NP) sensitivities of all these observables and obtain bounds on a few NP Wilson coefficients in $b\to u\tau {\nu }_{\tau }$ decays using the available data. We have noted that the data at present allows sizeable NP contributions in this mode. Also, we have predicted a few angular observables relevant to these decay modes.

Version to be published in JHEP

References in corpus (9)

• Angular Distributions of B -> K ll Decays
• Extraction of $|V_{cb}|$ from $B\to D^{(\ast )}\ell {\nu }_{\ell }$ and the Standard Model predictions of $R(D^{(\ast )})$
• $B\to \pi \ell \nu$ and $B_s\to K\ell \nu$ form factors and $|V_{ub}|$ from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
• The $\bar{B}\to \pi$ form factors from QCD and their impact on $|V_{ub}|$
• New Physics effects in leptonic and semileptonic decays
• A comprehensive study on the semileptonic decay of heavy flavor mesons
• $B\to \rho l\bar{\nu }$ and $\omega l\bar{\nu }$ in and beyond the Standard Model: Improved predictions and $|V_{ub}|$
• A closer look at the extraction of $|V_{ub}|$ from $B\to \pi l\nu$
• Mapping out the Space for New Physics with Leptonic and Semileptonic $B_{(c)}$ Decays

Cited by in corpus (3)

• Precision calculations of $B_{d,s}\to \pi ,K$ decay form factors in soft-collinear effective theory
• On sum rules for semi-leptonic $b\to c$ and $b\to u$ decays
• Study of Form Factors and Observables in $B_c^{-}\to {\bar{D}}^{(\ast )0}{\ell }^{-}{\bar{\nu }}_{\ell }$ and $B_c^{-}\to D^{(\ast )-}{\ell }^{+}{\ell }^{-}$ decays