First Observation of Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: ${\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-}$

Abstract

We report the first observation of the decay ${\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-}$ using a 980 $\mathrm{f}{\mathrm{b}}^{-1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. This is the first doubly Cabibbo-suppressed decay of a charmed baryon to be observed. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be $\mathcal{B}({\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-})/\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})=(2.35\pm 0.27\pm 0.21)\times 10^{-3}$, where the uncertainties are statistical and systematic, respectively.

6 pages, 3 figures

References in corpus (4)

• PYTHIA 6.4 Physics and Manual
• Big-Bang Nucleosynthesis
• Measurement of the Branching Fraction Br(Lambda_c+ -> p K- pi+)
• Strong phases, asymmetries, and SU(3) symmetry breaking in D --> K pi decays

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