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arXiv · 1509.03034

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

Y. -Y. Chang·M. -Z. Wang·A. Abdesselam·I. Adachi·K. Adamczyk·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·T. Aushev·V. Babu·I. Badhrees·A. M. Bakich·E. Barberio·B. Bhuyan·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·R. Chistov·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·J. Dingfelder·Z. Doležal·Z. Drásal·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·S. Ganguly·A. Garmash·R. Gillard·R. Glattauer·Y. M. Goh·P. Goldenzweig·D. Greenwald·O. Grzymkowska·J. Haba·K. Hayasaka·H. Hayashii·X. H. He·W. -S. Hou·C. -L. Hsu·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·D. Joffe·K. K. Joo·T. Kawasaki·D. Y. Kim·H. J. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·T. Kumita·A. Kuzmin·Y. -J. Kwon·Y. -T. Lai·I. S. Lee·L. Li·Y. Li·J. Libby·D. Liventsev·P. Luki·M. Masuda·K. Miyabayashi·H. Miyake·H. Miyata·R. Mizuk·G. B. Mohanty·S. Mohanty·A. Moll·H. K. Moon·T. Mori
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Abstract

We report the first observation of the decays $B^0 \rightarrow p\bar{\Lambda} D^{(*)-}$. The data sample of $711$ fb$^{-1}$ used in this analysis corresponds to $772$ million $B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ 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 $B^0 \rightarrow p\bar{\Lambda} D^{-}$ and $B^0 \rightarrow p\bar{\Lambda} D^{*-}$ to be $(25.1\pm2.6\pm3.5)\times10^{-6}$ and $(33.6\pm6.3\pm4.4)\times10^{-6}$, 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.

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Y. -Y. Chang, M. -Z. Wang, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, V. Babu, I. Badhrees, A. M. Bakich, E. Barberio, B. Bhuyan, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, P. Goldenzweig, D. Greenwald, O. Grzymkowska, J. Haba, K. Hayasaka, H. Hayashii, X. H. He, W. -S. Hou, C. -L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, D. Joffe, K. K. Joo, T. Kawasaki, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. -J. Kwon, Y. -T. Lai, I. S. Lee, L. Li, Y. Li, J. Libby, D. Liventsev, P. Luki, M. Masuda, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, G. B. Mohanty, S. Mohanty, A. Moll, H. K. Moon, T. Mori. 2015-09-10. Observation of $B^{0} \rightarrow p\bar{\Lambda} D^{(*)-}$. https://doi.org/10.1103/physrevlett.115.221803

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