Analyzing lepton flavor universality in the decays ${\Lambda }_b\to {\Lambda }_c^{(\ast )}({\frac{1}{2}}^{\pm },{\frac{3}{2}}^{-})+\ell {\bar{\nu }}_{\ell }$

Abstract

Lepton flavor universality can be tested in the semileptonic decays ${\Lambda }_b\to {\Lambda }_c^{(\ast )}$ where ${\Lambda }_c^{(\ast )}$ denotes either the ground state ${\Lambda }_c(2286)$ (with $J^P=1/2^{+}$) or its orbital excitations ${\Lambda }_c(2595)$ (with $J^P=1/2^{-}$) and ${\Lambda }_c(2625)$ (with $J^P=3/2^{-}$). We calculate the differential decay rates as well as the branching fractions of these decays for both tauonic and muonic modes with form factors obtained from a covariant confined quark model previously developed by us. We present results for the rate ratios of the tauonic and muonic modes which provide important tests of lepton flavor universality in forthcoming experiments.

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Cited by in corpus (4)

• Semileptonic $D_{(s)}$-meson decays in the light of recent data
• Study of $B_s\to {\ell }^{+}{\ell }^{-}\gamma$ decays in covariant quark model
• ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595,2625){\ell }^{-}\bar{\nu }$ form factors from lattice QCD
• Heavy baryon wave functions, Bakamjian-Thomas approach to form factors, and observables in ${\Lambda }_b\to {\Lambda }_c\left({\frac{1}{2}}^{\pm }\right)\ell \overline{\nu }$ transitions