Observation of B⁰ rightarrow pbar{Λ} D^{(*)-}

Y.-Y. Chang , M.-Z. Wang , A. Abdesselam , I. Adachi , K. Adamczyk , H. Aihara , S. Al Said , D. M. Asner

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H. Atmacan T. Aushev V. Babu I. Badhrees A. M. Bakich E. Barberio B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov 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. Dole\v{z}al Z. Dr\'asal 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. Kri\v{z}an 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 E. Nakano M. Nakao T. Nanut M. Nayak S. Nishida S. Ogawa H. Ozaki P. Pakhlov G. Pakhlova B. Pal C. W. Park T . K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen J. Rauch E. Ribe\v{z}l M. Ritter A. Rostomyan S. Ryu H. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo I. S. Seong M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon Y.-S. Sohn M. Stari\v{c} J. Stypula M. Sumihama K. Sumisawa T. Sumiyoshi U. Tamponi K. Tanida Y. Teramoto T. Uglov Y. Unno S. Uno Y. Usov C. Van Hulse P. Vanhoefer G. Varner V. Vorobyev A. Vossen M. N. Wagner C. H. Wang P. Wang M. Watanabe Y. Watanabe K. M. Williams E. Won J. Yamaoka S. Yashchenko J. Yelton Y. Yusa Z. P. Zhang V. Zhulanov A. Zupanc

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classification ✦ hep-ex

keywords lambdarightarrowdecaysfirstobservationobservedsigmatimes10

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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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Observation of B⁰ rightarrow pbar{Λ} D^{(*)-}

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