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fitter is utilized to improve the measured precision. Among the measurements for twelve Λ decay mode j, the ST yield is determined to bewhereis the total number of produced Λ where ε ij is the efficiency for simultaneously reconstruct- Because of the large acceptance of the BESIII detec-182 tor and the low multiplicities of Λ c hadronic decays, whereis the average DT efficiency

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We report the first direct measurement of decays of the Λ + c baryon involving the neutron. The 118 analysis is performed using 567 pb −1 of e + e − collision data collected at √ s = 4.599 GeV with the BESIII detector at the BEPCII collider. We observe the decay Λ 188The BESIII detector is a cylindrical detector with a solid-angle coverage of 93% of 4π that operates at the

Using 2.92 fb −1 of electron-positron annihilation data collected at √ s = 3.773 GeV with the BESIII detector, we obtain the first measurements of the absolute branching fractionL e + νe differential decay rate distribution, the product of the hadronic form factor and the magnitude of the CKM matrix element, f K + (0)|Vcs|, is determined 3 to be 0.728 ± 0.006(stat.) ± 0.011(sys.). Using |Vcs| from the SM constrained fit with the measured f K + (0)|Vcs|, f K + (0) = 0.748 ± 0.007(stat.) ± 0.012(sys.) is obtained, and utilizing the unquenched LQCD calculation for f K + (0), |Vcs| = 0.975 ± 0.008(stat.) ± 0.015(sys.) ± 0.025(LQCD).

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