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Study of $B^{+} \to p \bar{Λ} γ$ , $p \bar{Λ} π^{0}$ and $B^{0} \to p \bar{Λ} π^{-}$

M.-Z. Wang²⁴, Y.-J. Lee²⁴, K. Abe⁴⁰, I. Adachi⁷, H. Aihara⁴², D. Anipko¹, T. Aushev^11,16, S. Bahinipati², A. M. Bakich³⁷ et al. (Belle Collaboration)

A. M. Bakich³⁷, I. Bedny¹, K. Belous¹⁰, I. Bizjak¹², S. Blyth²², A. Bondar¹, M. Bračko^7,12,18, T. E. Browder⁶, M.-C. Chang³, Y. Chao²⁴, A. Chen²², K.-F. Chen²⁴, W. T. Chen²², B. G. Cheon⁵, R. Chistov¹¹, I.-S. Cho⁴⁷, Y. Choi³⁶, Y. K. Choi³⁶, S. Cole³⁷, J. Dalseno¹⁹, M. Dash⁴⁶, S. Eidelman¹, S. Fratina¹², G. Gokhroo³⁸, H. Ha¹⁴, J. Haba⁷, K. Hayasaka²⁰, M. Hazumi⁷, D. Heffernan²⁹, T. Hokuue²⁰, Y. Hoshi⁴⁰, W.-S. Hou²⁴, Y. B. Hsiung²⁴, H. J. Hyun¹⁵, T. Iijima²⁰, K. Ikado²⁰, A. Imoto²¹, K. Inami²⁰, A. Ishikawa⁴², R. Itoh⁷, M. Iwasaki⁴², Y. Iwasaki⁷, N. Joshi³⁸, D. H. Kah¹⁵, J. H. Kang⁴⁷, N. Katayama⁷, T. Kawasaki²⁷, H. Kichimi⁷, Y. J. Kim⁴, K. Kinoshita², P. Križan^12,17, P. Krokovny⁷, R. Kumar³⁰, C. C. Kuo²², Y.-J. Kwon⁴⁷, J. S. Lee³⁶, M. J. Lee³⁴, S. E. Lee³⁴, T. Lesiak²⁵, S.-W. Lin²⁴, D. Liventsev¹¹, F. Mandl⁹, T. Matsumoto⁴⁴, S. McOnie³⁷, T. Medvedeva¹¹, W. Mitaroff⁹, H. Miyake²⁹, H. Miyata²⁷, Y. Miyazaki²⁰, R. Mizuk¹¹, G. R. Moloney¹⁹, M. Nakao⁷, S. Nishida⁷, O. Nitoh⁴⁵, T. Ohshima²⁰, S. Okuno¹³, Y. Onuki³², W. Ostrowicz²⁵, H. Ozaki⁷, P. Pakhlov¹¹, G. Pakhlova¹¹, H. Palka²⁵, C. W. Park³⁶, H. Park¹⁵, K. S. Park³⁶, R. Pestotnik¹², L. E. Piilonen⁴⁶, Y. Sakai⁷, N. Satoyama³⁵, O. Schneider¹⁶, J. Schümann⁷, A. J. Schwartz², K. Senyo²⁰, M. Shapkin¹⁰, H. Shibuya³⁹, B. Shwartz¹, A. Sokolov¹⁰, A. Somov², N. Soni³⁰, M. Starič¹², H. Stoeck³⁷, T. Sumiyoshi⁴⁴, F. Takasaki⁷, K. Tamai⁷, M. Tanaka⁷, Y. Teramoto²⁸, X. C. Tian³¹, T. Tsukamoto⁷, S. Uehara⁷, K. Ueno²⁴, T. Uglov¹¹, Y. Unno⁵, S. Uno⁷, Y. Usov¹, G. Varner⁶, K. E. Varvell³⁷, K. Vervink¹⁶, S. Villa¹⁶, A. Vinokurova¹, C. H. Wang²³, P. Wang⁸, Y. Watanabe⁴³, E. Won¹⁴, Q. L. Xie⁸, A. Yamaguchi⁴¹, Y. Yamashita²⁶, Z. P. Zhang³³, V. Zhilich¹, V. Zhulanov¹, and A. Zupanc¹² (Belle Collaboration)

¹Budker Institute of Nuclear Physics, Novosibirsk
²University of Cincinnati, Cincinnati, Ohio 45221
³Department of Physics, Fu Jen Catholic University, Taipei
⁴The Graduate University for Advanced Studies, Hayama
⁵Hanyang University, Seoul
⁶University of Hawaii, Honolulu, Hawaii 96822
⁷High Energy Accelerator Research Organization (KEK), Tsukuba
⁸Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
⁹Institute of High Energy Physics, Vienna
¹⁰Institute of High Energy Physics, Protvino
¹¹Institute for Theoretical and Experimental Physics, Moscow
¹²J. Stefan Institute, Ljubljana
¹³Kanagawa University, Yokohama
¹⁴Korea University, Seoul
¹⁵Kyungpook National University, Taegu
¹⁶Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
¹⁷University of Ljubljana, Ljubljana
¹⁸University of Maribor, Maribor
¹⁹University of Melbourne, School of Physics, Victoria 3010
²⁰Nagoya University, Nagoya
²¹Nara Women’s University, Nara
²²National Central University, Chung-li
²³National United University, Miao Li
²⁴Department of Physics, National Taiwan University, Taipei
²⁵H. Niewodniczanski Institute of Nuclear Physics, Krakow
²⁶Nippon Dental University, Niigata
²⁷Niigata University, Niigata
²⁸Osaka City University, Osaka
²⁹Osaka University, Osaka
³⁰Panjab University, Chandigarh
³¹Peking University, Beijing
³²RIKEN BNL Research Center, Upton, New York 11973
³³University of Science and Technology of China, Hefei
³⁴Seoul National University, Seoul
³⁵Shinshu University, Nagano
³⁶Sungkyunkwan University, Suwon
³⁷University of Sydney, Sydney, New South Wales
³⁸Tata Institute of Fundamental Research, Mumbai
³⁹Toho University, Funabashi
⁴⁰Tohoku Gakuin University, Tagajo
⁴¹Tohoku University, Sendai
⁴²Department of Physics, University of Tokyo, Tokyo
⁴³Tokyo Institute of Technology, Tokyo
⁴⁴Tokyo Metropolitan University, Tokyo
⁴⁵Tokyo University of Agriculture and Technology, Tokyo
⁴⁶Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁴⁷Yonsei University, Seoul

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Phys. Rev. D 76, 052004 – Published 21 September, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.052004

Abstract

We study the following charmless baryonic three-body decays of $B$ mesons: $B^{+} \to p \bar{Λ} γ$ , $B^{+} \to p \bar{Λ} π^{0}$ , and $B^{0} \to p \bar{Λ} π^{-}$ . The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. This study includes the first observation of $B^{+} \to p \bar{Λ} π^{0}$ , which is measured to have a branching fraction of $({3.00}_{- 0.53}^{+ 0.61} \pm 0.33) \times 10^{- 6}$ . We also set upper limits on branching fractions of the two-body decays $B^{0} \to p {\bar{Σ}}^{* -}$ , $B^{0} \to Δ^{0} \bar{Λ}$ , $B^{+} \to p {\bar{Σ}}^{* 0}$ , and $B^{+} \to Δ^{+} \bar{Λ}$ at the 90% confidence level. These results are obtained from a $414 {fb}^{- 1}$ data sample collected near the $Υ (4 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider.