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[en] In this work we investigate the weak Λb→Λc semileptonic and nonleptonic decays. The light-front quark model and diquark picture for heavy baryons are adopted to evaluate the Λb→Λc transition form factors. In the heavy quark limit we study the Isgur-Wise function. The transition form factors are obtained in the whole physical momentum regions. The numerical predictions on the branching ratios of nonleptonic decay modes Λb→ΛcM and various polarization asymmetries are made. A comparison with other approaches is discussed
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