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- W4288804511 abstract "The measurement of the Cabibbo-favored semileptonic decay $Lambda_c^+rightarrow Lambda e^+nu_e$ is reported using a $4.5~mathrm{fb}^{-1}$ data sample of $e^+e^-$ annihilations collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be $mathcal{B}(Lambda_c^+rightarrow Lambda e^+nu_e)=(3.56pm0.11_{rm stat.}pm0.07_{rm syst.})%$, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in $Lambda_c^+rightarrow Lambda e^+nu_e$. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a $q^2$-integrated rate predicted by LQCD, we determine $|V_{cs}|=0.936pm0.017_{mathcal{B}}pm0.024_{rm LQCD}pm0.007_{tau_{Lambda_c}}$." @default.
- W4288804511 created "2022-07-30" @default.
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