Observation of $B^0\to p\bar{\Lambda }{D}^{(\ast )-}$

Abstract

We report the first observation of the decays $B^0\to p\bar{\Lambda }{D}^{(\ast )-}$. The data sample of $711$ fb${}^{-1}$ used in this analysis corresponds to $772$ million $B\bar{B}$ pairs, collected at the ${\rm Y}(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We observe $19.8\sigma$ and $10.8\sigma$ excesses of events for the two decay modes and measure the branching fractions of $B^0\to p\bar{\Lambda }{D}^{-}$ and $B^0\to p\bar{\Lambda }{D}^{\ast -}$ to be $(25.1\pm 2.6\pm 3.5)\times 10^{-6}$ and $(33.6\pm 6.3\pm 4.4)\times 10^{-6}$, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the di-baryon ($p\bar{\Lambda }$) system is observed, consistent with that observed in similar $B$ decays.

arXiv comment16 pages, 3 figures and 3 tables, submitted to PRL

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• Measurement of Branching Fractions of Hadronic Decays of the ${\Omega }_c^0$ Baryon
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