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 \( {\Xi}_c^0\to {\Sigma}^{-}{K}^{+} \) 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 \( {\Xi}_c^0\to {\Sigma}^0{K}^0 \) are possible to be distinguished from \( {\Xi}_c^{+}\to {\Sigma}^{+}{K}_S \) and \( {\Xi}_c^0\to {\Sigma}^0{K}_S \). 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.
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Meng, G., Wong, S.MY. & Xu, F. Doubly Cabibbo-suppressed decays of antitriplet charmed baryons. J. High Energ. Phys. 2020, 126 (2020). https://doi.org/10.1007/JHEP11(2020)126
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DOI: https://doi.org/10.1007/JHEP11(2020)126