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

Abstract

The semileptonic decays of ${\Lambda }_b\to {\Lambda }_c^{(\ast )}\ell {\nu }_{\ell }$ and ${\Lambda }_c\to {\Lambda }^{(\ast )}\ell {\nu }_{\ell }$ 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 ${\Lambda }_{(c)}^{(\ast )}$ 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.

17 pages, 9 tables and 6 figures

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