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arXiv · hep-ex/0111032

Observation of Cabibbo-suppressed and W-exchange Lambda_c^+ baryon decays

Belle Collaboration·K. Abe
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Abstract

We present measurements of the Cabibbo-suppressed decays Lambda_c^+ --> Lambda0 K+ and Lambda_c^+ --> Sigma0 K+ (both first observations), Lambda_c^+ --> Sigma+ K+ pi- (seen with large statistics for the first time), Lambda_c^+ --> p K+ K- and Lambda_c^+ --> p phi (measured with improved accuracy). Improved branching ratio measurements for the decays Lambda_c^+ --> Sigma+ K+ K- and Lambda_c^+ --> Sigma+ phi, which are attributed to W-exchange diagrams, are shown. We also present the first evidence for Lambda_c^+ --> Xi(1690)^0 K+ and set an upper limit on the non-resonant decay Lambda_c^+ --> Sigma+ K+ K-. This analysis was performed using 32.6 fb^{-1} of data collected by the Belle detector at the asymmetric e+ e- collider KEKB.

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Belle Collaboration, K. Abe. 2001-11-10. Observation of Cabibbo-suppressed and W-exchange Lambda_c^+ baryon decays. https://doi.org/10.1016/s0370-2693(01)01373-9

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