Doubly Cabibbo-suppressed decays of antitriplet charmed baryons

Abstract

Doubly Cabibbo-suppressed (DCS) nonleptonic weak decays of antitriplet charmed baryons are studied systematically in this work. The factorizable and nonfactorizable contributions can be classified explicitly in the topological-diagram approach and treated separately. In particular, the evaluation of nonfactorizable terms is based on the pole model in conjunction with current algebra. All three types of relevant non- perturbative parameters contributing factorizable and nonfactorizable terms are estimated in the MIT bag model. Branching fractions of all the DCS decays are predicted to be of order 10−4 ∼ 10−6. In particular, we find that the three modes {Xi}_c^{+}to {Sigma}^{+}{K}^0,{Sigma}^0{K}^{+} and {Xi}_c^0to {Sigma}^{-}{K}^{+} are as large as (1 ∼ 2) × 10−4, which are the most promising DCS channels to be measured. We also point out that the two DCS modes {Xi}_c^{+}to {Sigma}^{+}{K}^0 and {Xi}_c^0to {Sigma}^0{K}^0 are possible to be distinguished from {Xi}_c^{+}to {Sigma}^{+}{K}_S and {Xi}_c^0to {Sigma}^0{K}_S . The decay asymmetries for all the channels with a kaon in their final states are found to be large in magnitude and negative in sign.