Measurements of the Branching Fractions ${\cal B}(B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{'0})$, ${\cal B}(B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2645)^{0})$ and ${\cal B}(B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2790)^{0}) $

A. Bobrov; A. Bozek; A. Chen; A. Garmash; A. Giri; A. Ishikawa; A. Kuzmin; A. M. Bakich; A. Rostomyan; A. Sokolov

arxiv: 1911.12530 · v2 · pith:4LQLEQWMnew · submitted 2019-11-28 · ✦ hep-ex · hep-ph

Measurements of the Branching Fractions {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)^('0)), {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)(2645)⁰) and {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)(2790)⁰)

Belle Collaboration: Y. Li , Y. B. Li , C. P. Shen , I. Adachi , H. Aihara , D. M. Asner , H. Atmacan , V. Aulchenko

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R. Ayad V. Babu I. Badhrees A. M. Bakich P. Behera T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder M. Campajola L. Cao D. \v{C}ervenkov P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe G. De Nardo F. Di Capua S. Di Carlo Z. Dole\v{z}al T. V. Dong S. Eidelman J. E. Fast T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob B. Grube T. Hara K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo K. H. Kang G. Karyan H. Kichimi C. H. Kim D. Y. Kim S. H. Kim K. Kinoshita P. Kody\v{s} R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis C. H. Li L. K. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk R. Mussa K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. R\"ohrken A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya L. Santelj V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} Z. S. Stottler M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno R. Van Tonder G. Varner A. Vinokurova C. H. Wang M.-Z. Wang X. L. Wang M. Watanabe E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov

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keywords lambdabranchingtimesdatadecaysfirstfractionsmeasurements

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Using the data sample of 711 fb$^{-1}$ of $\Upsilon(4S)$ on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays $B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{'0}$, $B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2645)^{0}$, and $B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2790)^{0} $. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against $\bar{\Lambda}_{c}^{-}$ baryons in selected $B^-$ candidates. The branching fraction of $B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2790)^{0}$ is measured to be $ (1.1 \pm 0.4 \pm 0.2)\times 10^{-3}$, where the first uncertainty is statistical and the second systematic. The 90\% credibility level upper limits on ${\cal B}(B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{'0})$ and ${\cal B}(B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}(2645)^{0})$ are determined to be $6.5\times 10^{-4}$ and $7.9\times 10^{-4}$, respectively.

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Measurements of the Branching Fractions {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)^('0)), {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)(2645)⁰) and {cal B}(B⁻ to bar{Λ}_(c)⁻ Xi_(c)(2790)⁰)

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