# Model independent analysis of $ B^* \to P \ell \bar{\nu}_\ell$ decay processes

## TL;DR

This paper investigates potential new physics effects in semileptonic B* meson decays, constrained by recent anomalies, and predicts observable deviations from the Standard Model that could be tested at the LHC.

## Contribution

It provides a model-independent analysis of B* decay processes considering vector and scalar interactions, constrained by current experimental data, and predicts measurable deviations from the Standard Model.

## Key findings

- Branching ratios significantly deviate for vector couplings.
- Predicted observables are within reach of LHC Run III.
- Analysis constrains new physics couplings using recent experimental data.

## Abstract

Very compelling deviations in the recently observed lepton nonuniversality observables $\big (R_{D^{(*)}}, R_{K^{(*)}}, R_{J/\psi} \big )$ of semileptonic $B$ meson decays from their Standard Model predictions hint towards the presence of some kind of new physics beyond it. In this regard, we investigate the effect of new physics in the semileptonic $\bar B_{d(s)}^* \to P \ell \bar{\nu}_\ell$ decay processes, where $P=D,\pi (D_s,K$), in a model independent way. We consider the presence of additional vector and scalar type interactions and constrain the corresponding new couplings by fitting ${\rm Br(B_{u}^+ \to \tau^+ \nu_\tau)}$, ${\rm Br(B \to \pi \tau \bar \nu_\tau)}$, ${\rm Br(B_{c}^+ \to \tau^+ \nu_\tau)}$, $R_\pi^l$, $R_{D^{(*)}}$ and $R_{J/\psi}$ data. Using the constrained new parameters, we estimate the branching ratios, forward-backward asymmetry, lepton-spin asymmetry and lepton non-universality observables of $\bar B_{d,s}^{*} \to P \tau \bar \nu_\tau$ processes. We find that the branching ratios of these decay modes are sizeable and deviate significantly (for vector-type couplings) from their corresponding standard model values, which are expected to be within the reach of Run III of Large Hadron Collider experiment.