Revisiting semileptonic decays of $\Lambda_{b(c)}$ supported by baryon spectroscopy

TL;DR

This paper investigates semileptonic decays of heavy baryons using a baryon spectroscopy approach, providing detailed theoretical predictions for decay properties and baryon structures to aid experimental studies.

Contribution

It introduces a baryon spectroscopy-based three-body wave function approach, moving beyond the quark-diquark approximation for semileptonic decay analysis.

Findings

Calculated form factors, partial widths, and branching fractions.

Analyzed lepton polarization and forward-backward asymmetries.

Provided insights into baryon structure and decay dynamics.

Abstract

The semileptonic decays of $\Lambda_{b}\to\Lambda_{c}^{(*)}\ell\nu_\ell$ and $\Lambda_{c}\to\Lambda^{(*)}\ell\nu_\ell$ are studied in the light-front quark model in this work. Instead of the quark-diquark approximation, we use the three-body wave functions obtained by baryon spectroscopy. The ground states $(1/2^{+})$, the $\lambda$-mode orbital excited states $(1/2^{-})$, and the first radial excited states $(1/2^{+})$ of $\Lambda_{(c)}^{(*)}$ are considered. The discussions are given for the form factors, partial widths, branching fractions, leptonic forward-backward asymmetries, hadron polarizations, lepton polarizations, and the lepton flavor universalities. Our results are useful for the inputs of heavy baryon decays and understanding the baryon structures, and helpful for experimental measurements.