Evidence For Semileptonic B- -> P(P)Over-Barl(-)(Nu)Over-Bar(L) Decays

K. J. Tien,M. Z. Wang,Ichiro Adachi,H. Aihara,David M. Asner,Vladimir M. Aulchenko,Tagir A Kh Aushev,A. M. Bakich,A. Bala,B. Bhuyan,Andrzej Bozek,M. Bra?ko,T. E. Browder,P. Chang,Vladimir Chekelian,A. Chen,Pisin Chen,Byunggu Cheon,K. Chilikin, Ruslan N. Chistov,I. S. Cho,Kyubo Cho,V. Chobanova,Y. K. Choi,D. Cinabro,J. P. Dalseno, Michael M. Danilov,Zden��k Dole?al,Zbyn��k Dr��sal,D. Dutta,S. I. Eidelman,Hassan Farhat,J. E. Fast,Torben Ferber,V. Gaur,Satabdi Ganguly,R. Gillard,Y. M. Goh,B. Golob,Junji Haba,Hisaki Hayashii,Y. Horii,Y. Hoshi,W. S. Hou,Y. B. Hsiung,M. Huschle,Hyojung Hyun,T. Iijima,A. Ishikawa,Ryousuke Itoh, Y. Iwasaki,T. Danger Julius,Dongha Kah,Juhwan Kang,E. Kato,Takeo Kawasaki,Hiromichi Kichimi,Ch M. K��esling,D. Y. Kim,Hongju Kim, J. B. Kim, Junghyun Kim,Youngjin Kim,J. Klucar,B. R. Ko,Peter Kody?,Samo Korpar,P. Kri?an,Pavel P. Krokovny,B. Kronenbitter,T. Kuhr,Tetsuro Kumita,A. Kuzmin,Y. J. Kwon,Soohyung Lee,J. Li,Y. Li,Jim F. Libby,C. Y. Liu,Yenwei Liu,D. Liventsev,Peter A. Lukin,Kenkichi Miyabayashi,H. Miyata,G. B. Mohanty,Andreas Moll,Roberto Mussa,E. Nakano, M. Nakao,Z. Natkaniec,M. Nayak,E. Nedelkovska,C. Ng,N. K. Nisar,S. Nishida,Osamu Nitoh,S. Ogawa,Shin'ya Okuno,S. L. Olsen,W. Ostrowicz,Christian Oswald,Chongwyun Park,H. K. Park,Todd K. Pedlar,Rok Pestotnik,M. Petri?,Leo E. Piilonen,Michael W. Ritter,Markus R?hrken,Armine A. Rostomyan,Himansu Sahoo,T. Y. Saito, Y. Sakai,S. Sandilya,D. Santel,Luka ?antelj,Tomoyuki Sanuki,Yoshio Sato,V. Savinov,Olivier Schneider,Gunar Schnell,Christoph Schwanda,D. Semmler,K. Senyo,O. Seon,Martin E. Sevior,M. M. Shapkin, C. P. Shen,Toshiaki Shibata,J. G. Shiu,Alexei L. Sibidanov,Y. S. Sohn,A. V. Sokolov,Samo Stani?,Marko Stari?,Michael Steder,Mizuki Sumihama,T. Sumiyoshi,K. Tanida,Gocha T. Tatishvili,Y. Teramoto,Masahiro Uchida,S. Uehara,T. Uglov, Y. Unno,S. Uno,Phillip Urquijo,Sven E. Vahsen,Charlotte Van Hulse,P. Vanhoefer,Gary S. Varner,Kevin E. Varvell,Anna Vinokurova,V. Vorobyev, M. N. Wagner,C. H. Wang,Ping Wang,M. Watanabe,Yosuke Watanabe,Kerry M. Williams,Eunil Won,Jared Yamaoka, Y. Yamashita,S. V. Yashchenko,Ziping Zhang,Victor N. Zhilich,Vladimir V. Zhulanov, A. Zupanc

PHYSICAL REVIEW D（2014）

Cited 18|Views132

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Abstract

We find evidence for the semileptonic baryonic decay B- -> p (p) over barl(-)(nu) over bar (l) (l = e, mu), based on a data sample of 772 million B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. A neural-network based hadronic B-meson tagging method is used in this study. The branching fraction of B- -> p (p) over barl(-)(nu) over bar (l) is measured to be (5.8(-2.1)(+2.4)(stat) +/- 0.9(syst)) x 10(-6) with a significance of 3.2 sigma s, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B- -> p (p) over barl(-)(nu) over bar (l)) < 9.6 x 10(-6) at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.

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