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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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Based on a sample of (1310.6±10.5)×10 6 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γφφ is performed in order to study the intermediate states. +56−33 MeV/c 2 , are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ → γφφ. The product branching fractions B(J/ψ → γX) × B(X → φφ) are reported.

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