Semileptonic decays $\Lambda_c^+ \to \Lambda \ell^+ \nu_\ell\,\,(\ell=e,\mu)$ in the covariant quark model and comparison with the new absolute branching fraction measurements of Belle and BESIII

TL;DR

This paper provides precise theoretical predictions for the semileptonic decay branching fractions of Lambda_c+ baryons using a covariant quark model, aligning well with recent experimental measurements from Belle and BESIII.

Contribution

The study offers new, accurate theoretical calculations of Lambda_c+ semileptonic decay branching fractions within a covariant quark model, validated against recent experimental data.

Findings

Predicted branching fractions agree with Belle and BESIII measurements.

Provided detailed decay distribution and polarization predictions.

Validated the covariant quark model for charm baryon decays.

Abstract

We present precise theoretical predictions for the absolute branching fractions of $\Lambda_c^+ \to \Lambda \ell^+ \nu_\ell\,(\ell=e,\mu)$ decays in the covariant confined quark model. This study is motivated by two recent and accurate measurements of the absolute branching fractions of $\Lambda_c^+ \to p K^- \pi^+$ and $\Lambda_c^+ \to \Lambda e^+ \nu_e$ by the Belle Collaboration at the KEKB and by the BESIII Collaboration at the BEPCII. Our predictions for the branching fractions are consistent with both experimental results. We also provide detailed numerical results for differential decay distributions and polarization observables.