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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
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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.
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Investigation of $\Lambda_c \to (\Lambda,n)\ell^+ \nu_\ell $ Decays in Standard Model and Beyond
A model-independent analysis of Lambda_c to (Lambda, neutron) l nu decays finds SM rates about 10 percent above experiment and proposes the muon-to-electron forward-backward asymmetry ratio as a robust new physics probe.
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