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We study Cabibbo-favored (CF) and singly Cabibbo-suppressed (SCS) two-bodyhadronic weak decays of the antitriplet charmed baryons $\Lambda_c^+$,$\Xi_c^0$ and $\Xi_c^+$ with more focus on the last two. Both factorizable andnonfactorizable contributions are considered in the topologic diagram approach.The estimation of nonfactorizable contributions from $W$-exchange and inner$W$-emission diagrams relies on the pole model and current algebra. Thenon-perturbative parameters in both factorizable and nonfactorizable parts arecalculated in the MIT bag model. Branching fractions and up-down decayasymmetries for all the CF and SCS decays of antitriplet charmed baryons arepresented. The prediction of $\mathcal{B}(\Xi_c^+\to \Xi^0\pi^+ )$ agrees wellwith the measurements inferred from Belle and CLEO, while the calculated ${\calB}(\Xi_c^0\to \Xi^-\pi^+)$ is too large compared to the recent Bellemeasurement. We conclude that these two $\Xi_c\to\Xi \pi^+$ modes cannot besimultaneously explained within the current-algebra framework for $S$-waveamplitudes. This issue needs to be resolved in future study. The long-standingpuzzle with the branching fraction and decay asymmetry of $\Lambda_c^+\to\Xi^0K^+$ is resolved by noting that only type-II $W$-exchange diagram willcontribute to this mode. We find that not only the calculated rate agrees withexperiment but also the predicted decay asymmetry is consistent with theSU(3)-flavor symmetry approach in sign and magnitude. Likewise, the CF mode$\Xi_c^0\to \Sigma^+K^-$ and the SCS decays $\Xi_c^0\to pK^-,\Sigma^+\pi^-$proceed only through type-II $W$-exchange. They are predicted to have large and{\it positive} decay asymmetries. These features can be tested in the nearfuture.

Two-body hadronic weak decays of antitriplet charmed baryons