APS » Phys. Rev. Lett. » Volume 97 » Issue 25

K. Ikado,²⁴ K. Abe,⁸ K. Abe,⁴⁸ I. Adachi,⁸ H. Aihara,⁵⁰ K. Akai,⁸ M. Akemoto,⁸ D. Anipko,¹ K. Arinstein,¹ V. Aulchenko,¹ T. Aushev,¹⁴ T. Aziz,⁴⁶ A. M. Bakich,⁴⁵ V. Balagura,¹⁴ M. Barbero,⁷ A. Bay,²⁰ I. Bedny,¹ K. Belous,¹³ U. Bitenc,¹⁵ I. Bizjak,¹⁵ A. Bondar,¹ A. Bozek,²⁹ M. Brako,^8,22,15 T. E. Browder,⁷ P. Chang,²⁸ A. Chen,²⁶ W. T. Chen,²⁶ Y. Choi,⁴⁴ S. Cole,⁴⁵ J. Dalseno,²³ M. Danilov,¹⁴ M. Dash,⁵⁶ S. Eidelman,¹ D. Epifanov,¹ J. Flanagan,⁸ S. Fratina,¹⁵ K. Furukawa,⁸ N. Gabyshev,¹ T. Gershon,⁸ A. Go,²⁶ G. Gokhroo,⁴⁶ B. Golob,^21,15 A. Goriek,¹⁵ H. Ha,¹⁷ J. Haba,⁸ K. Hara,⁸ T. Hara,³⁴ N. C. Hastings,⁵⁰ K. Hayasaka,²⁴ H. Hayashii,²⁵ M. Hazumi,⁸ L. Hinz,²⁰ T. Hokuue,²⁴ Y. Hoshi,⁴⁸ S. Hou,²⁶ W.-S. Hou,²⁸ N. Iida,⁸ T. Iijima,²⁴ A. Imoto,²⁵ K. Inami,²⁴ A. Ishikawa,⁵⁰ H. Ishino,⁵¹ R. Itoh,⁸ M. Iwasaki,⁵⁰ Y. Iwasaki,⁸ T. Kamitani,⁸ J. H. Kang,⁵⁷ S. U. Kataoka,²⁵ N. Katayama,⁸ H. Kawai,² T. Kawasaki,³¹ H. Kichimi,⁸ E. Kikutani,⁸ H. J. Kim,¹⁹ H. O. Kim,⁴⁴ K. Kinoshita,⁴ H. Koiso,⁸ S. Korpar,^22,15 P. Krian,^21,15 P. Krokovny,¹ R. Kulasiri,⁴ R. Kumar,³⁵ C. C. Kuo,²⁶ A. Kuzmin,¹ Y.-J. Kwon,⁵⁷ J. S. Lange,⁵ G. Leder,¹² J. Lee,⁴² T. Lesiak,²⁹ A. Limosani,⁸ S.-W. Lin,²⁸ D. Liventsev,¹⁴ D. Marlow,³⁸ T. Matsumoto,⁵² A. Matyja,²⁹ S. McOnie,⁴⁵ S. Michizono,⁸ T. Mimashi,⁸ W. Mitaroff,¹² K. Miyabayashi,²⁵ H. Miyata,³¹ Y. Miyazaki,²⁴ R. Mizuk,¹⁴ T. Nagamine,⁴⁹ I. Nakamura,⁸ T. T. Nakamura,⁸ E. Nakano,³³ M. Nakao,⁸ S. Nishida,⁸ O. Nitoh,⁵³ S. Noguchi,²⁵ T. Nozaki,⁸ S. Ogawa,⁴⁷ Y. Ogawa,⁸ K. Ohmi,⁸ T. Ohshima,²⁴ N. Ohuchi,⁸ K. Oide,⁸ T. Okabe,²⁴ S. Okuno,¹⁶ S. L. Olsen,⁷ Y. Onuki,³¹ W. Ostrowicz,²⁹ H. Ozaki,⁸ P. Pakhlov,¹⁴ C. W. Park,⁴⁴ H. Park,¹⁹ R. Pestotnik,¹⁵ L. E. Piilonen,⁵⁶ A. Poluektov,¹ M. Rozanska,²⁹ Y. Sakai,⁸ T. Schietinger,²⁰ O. Schneider,²⁰ C. Schwanda,¹² K. Senyo,²⁴ M. E. Sevior,²³ M. Shapkin,¹³ H. Shibuya,⁴⁷ T. Shidara,⁸ B. Shwartz,¹ V. Sidorov,¹ A. Sokolov,¹³ A. Somov,⁴ S. Stani,³² M. Stari,¹⁵ H. Stoeck,⁴⁵ K. Sumisawa,³⁴ T. Sumiyoshi,⁵² S. Suzuki,⁴⁰ O. Tajima,⁸ F. Takasaki,⁸ K. Tamai,⁸ N. Tamura,³¹ M. Tanaka,⁸ M. Tawada,⁸ G. N. Taylor,²³ Y. Teramoto,³³ X. C. Tian,³⁶ K. Trabelsi,⁷ T. Tsuboyama,⁸ T. Tsukamoto,⁸ S. Uehara,⁸ T. Uglov,¹⁴ K. Ueno,²⁸ Y. Unno,⁸ S. Uno,⁸ Y. Usov,¹ G. Varner,⁷ S. Villa,²⁰ C. C. Wang,²⁸ C. H. Wang,²⁷ Y. Watanabe,⁵¹ E. Won,¹⁷ B. D. Yabsley,⁴⁵ A. Yamaguchi,⁴⁹ Y. Yamashita,³⁰ M. Yamauchi,⁸ M. Yoshida,⁸ Y. Yusa,⁵⁶ L. M. Zhang,⁴¹ Z. P. Zhang,⁴¹ V. Zhilich,¹ and D. Zürcher²⁰

(Belle Collaboration)

¹Budker Institute of Nuclear Physics, Novosibirsk
²Chiba University, Chiba
⁴University of Cincinnati, Cincinnati, Ohio 45221
⁵University of Frankfurt, Frankfurt
⁷University of Hawaii, Honolulu, Hawaii 96822
⁸High Energy Accelerator Research Organization (KEK), Tsukuba
¹²Institute of High Energy Physics, Vienna
¹³Institute of High Energy Physics, Protvino
¹⁴Institute for Theoretical and Experimental Physics, Moscow
¹⁵J. Stefan Institute, Ljubljana
¹⁶Kanagawa University, Yokohama
¹⁷Korea University, Seoul
¹⁹Kyungpook National University, Taegu
²⁰Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
²¹University of Ljubljana, Ljubljana
²²University of Maribor, Maribor
²³University of Melbourne, Victoria
²⁴Nagoya University, Nagoya
²⁵Nara Women's University, Nara
²⁶National Central University, Chung-li
²⁷National United University, Miao Li
²⁸Department of Physics, National Taiwan University, Taipei
²⁹H. Niewodniczanski Institute of Nuclear Physics, Krakow
³⁰Nippon Dental University, Niigata
³¹Niigata University, Niigata
³²Nova Gorica Polytechnic, Nova Gorica
³³Osaka City University, Osaka
³⁴Osaka University, Osaka
³⁵Panjab University, Chandigarh
³⁶Peking University, Beijing
³⁸Princeton University, Princeton, New Jersey 08544
⁴⁰Saga University, Saga
⁴¹University of Science and Technology of China, Hefei
⁴²Seoul National University, Seoul
⁴⁴Sungkyunkwan University, Suwon
⁴⁵University of Sydney, Sydney NSW
⁴⁶Tata Institute of Fundamental Research, Bombay
⁴⁷Toho University, Funabashi
⁴⁸Tohoku Gakuin University, Tagajo
⁴⁹Tohoku University, Sendai
⁵⁰Department of Physics, University of Tokyo, Tokyo
⁵¹Tokyo Institute of Technology, Tokyo
⁵²Tokyo Metropolitan University, Tokyo
⁵³Tokyo University of Agriculture and Technology, Tokyo
⁵⁶Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁵⁷Yonsei University, Seoul

We present the first evidence of the decay B^--, using 414 fb^-1 of data collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be (B^--)=(1.79(stat)(syst))×10^-4. This implies that f_B=0.229(stat)(syst) GeV and is the first direct measurement of this quantity.

©2006 The American Physical Society

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