Physical Review D, vol.108, no.3, 2023 (SCI-Expanded)
Based on e+e- collision data corresponding to an integrated luminosity of 4.5 fb-1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay Λ¯c-→n¯+X, where X refers to any possible final state particles, is measured. The absolute branching fraction is determined to be B(Λ¯c-→n¯+X)=(32.4±0.7±1.5)%, where the first uncertainty is statistical and the second systematic. Assuming CP symmetry, the measurement indicates that about one fourth of Λc+ (Λ¯c-) decay modes with a neutron (an antineutron) in the final state have not been observed.