What we can learn from the angular differential rates (only) in semileptonic $B \to D^* \ell \nu_\ell$ decays

TL;DR

This paper introduces a model-independent method focusing solely on angular distributions in semileptonic B to D* decays, enabling analysis without knowing |V_cb| and comparing experimental data with Standard Model predictions.

Contribution

It proposes a novel, model-independent approach based on angular distributions that does not require knowledge of |V_cb|, facilitating direct comparison of experimental data and theory.

Findings

Good consistency between some experimental results and Standard Model predictions

Method applicable to data from Belle and BelleII collaborations

Analysis does not depend on |V_cb| knowledge

Abstract

We present a simple approach to the study of semileptonic $B \to D^* \ell \nu_\ell$ decays based on the angular distributions of the final state particles only. Our approach is model independent and never requires the knowledge of $\vert V_{cb} \vert$. By studying such distributions in the case of light leptons, a comparison between results from different data sets from the Belle and BelleII Collaborations and between data and Standard Model calculations is also given for several interesting quantities. A good consistency is observed between some of the experimental results and the theoretical predictions.