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We present the first lattice-QCD calculation of the form factors governingthe charm-baryon semileptonic decays $\Lambda_c \to\Lambda^*(1520)\ell^+\nu_\ell$. As in our previous calculation of the$\Lambda_b \to \Lambda^*(1520)$ form factors, we work in the $\Lambda^*(1520)$rest frame, but here we use four different heavy-baryon momenta instead of justtwo. Because of the lower mass of the $\Lambda_c$, the moderately-sized momentaused here are sufficient to determine the form factors in the full kinematicrange of the semileptonic decay. We also update the analysis of our latticeresults for the $\Lambda_b \to \Lambda^*(1520)$ and $\Lambda_b \to\Lambda_c^*(2595,2625)$ form factors by imposing exact relations among thedifferent form factors at zero recoil that follow from rotational symmetry.Imposing these relations ensures the correct behavior of the angularobservables near the endpoint.

physical review. d/physical review. d.

$\Lambda_c \to \Lambda^*(1520)$ form factors from lattice QCD and  improved analysis of the $\Lambda_b \to \Lambda^*(1520)$ and $\Lambda_b \to  \Lambda_c^*(2595,2625)$ form factors