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The measurement of the Cabibbo-favored semileptonic decay$\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ is reported using$4.5~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected atcenter-of-mass energies ranging from 4.600~GeV to 4.699~GeV. The branchingfraction of the decay is measured to be $\mathcal{B}(\Lambda_c^+\rightarrow\Lambda \mu^+\nu_{\mu})=(3.48\pm0.14_{\rm stat.}\pm0.10_{\rm syst.})\%$, threetimes more precise than the prior world average result. Tests of lepton flavoruniversality using $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ ($\ell=e,\mu$) decays are reported for the first time, based on measurements of thedifferential decay rates and the forward-backward asymmetries in separatefour-momentum transfer regions. The results are compatible with Standard Modelpredictions. Furthermore, we improve the determination of the form-factorparameters in $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ decays, whichprovide stringent tests and calibration for lattice quantum chromodynamics(LQCD) calculations.

Study of $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ and Test of  Lepton Flavor Universality with $\Lambda_c^+\rightarrow \Lambda  \ell^+\nu_{\ell}$ Decays