Observation Of B-+/- -> X-C1 Pi(+/-) And Search For Direct Cp Violation

R. Kumar,Jaivir B. Singh,Kazuo Abe,Koya Abe,Hiroaki Aihara,D. A. Anipko,Tagir A Kh Aushev,Tariq Aziz,A. M. Bakich,Vladislav Balagura,Marlon B. Barbero,Aurelio Bay,I. V. Bedny,K. S. Belous,Urban Bitenc,S. C. Blyth, Andrzej Bozek,Marko Bračko,Thomas E. Browder,M. C. Chang,Augustine E. Chen,Weita Chen,Byunggu Cheon,Ruslan N. Chistov,Yoonsuk Choi,S. Cole,J. P. Dalseno,M. Dash,Alexey G. Drutskoy,Simon I. Eidelman,Saša Fratina,N. I. Gabyshev,Tim J. Gershon,G. Gokhroo,Boštjan Golob,Andrej Gorišek,Hyuncheong Ha,Junji Haba,Takanori Hara,Kiyoshi Hayasaka,Hisaki Hayashii,Masashi Hazumi,Daniel M. Heffernan,T. Hokuue,Yoshimoto Hoshi,Suen Hou,Weishu Hou,Toru Iijima,A. Imoto,Kenji Inami,Ryosuke Itoh, Yoshihito Iwasaki,Joohoon Kang,Nobuhiko Katayama,Hideyuki Kawai,Takeo Kawasaki,H. R. Khan,Hiromichi Kichimi,Kay Kinoshita,Pavel P. Krokovny, Chiencheng Kuo,Youngjoon Kwon,Garth D. Leder,Sunwen Lin,D. Liventsev,Franz Mandl,Daniel R. Marlow,Toshiro Matsumoto,Adam Tomasz Matyja,Winfried A. Mitaroff,Kenkichi Miyabayashi,Hideki Miyake,Hitoshi Miyata,Yoshiyuki Miyazaki,Roman V. Mizuk,Glenn R. Moloney,James A. Mueller,Eiichi Nakano,Mikihiko Nakao,Shohei Nishida,Osamu Nitoh,Seishi Noguchi,Takayoshi Ohshima,T. Okabe,Shoji Okuno,Stephen Lars Olsen,Yoshiyuki Onuki,Hitoshi Ozaki,P. N. Pakhlov,Galina V. Pakhlova,Henryk Pałka,H. K. Park,Kyoungsook Park,Rok Pestotnik,Leo E. Piilonen,Yoshihide Sakai,Thomas Schietinger,Olivier Schneider,J. Schümann,Christoph Schwanda,A. J. Schwartz,Ralf Seidl,M. M. Shapkin,Hiroshi Shibuya,Boris A. Shwartz,Veniamin A. Sidorov,Anatoli A. Sokolov,A. M. Somov,Nitesh O. Soni,Marko Starič,H. Stoeck,S. Y. Suzuki,Fumihiko Takasaki,Manobu Tanaka,Geoffrey N. Taylor,Yoshiki Teramoto,Xu Tian,I. N. Tikhomirov,Karim Trabelsi,Toru Tsuboyama, Toshifumi Tsukamoto,Sadaharu Uehara,T. Uglov,Koji Ueno,Shoji Uno,Yu V. Usov,Gary S. Varner,Stefano Villa,Chiachi Wang,Chunghsiang Wang,Hiroshi Wang,Yasushi Watanabe,Eunil Won,Qi Xie,Akira Yamaguchi,Yousuke Yamashita,Masanori Yamauchi,Changchun Zhang,Liming Zhang,Ziping Zhang, A. Zupanc

PHYSICAL REVIEW D（2006）

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摘要

We report the first observation of B-+/-->chi(c1)pi(+/-), a Cabibbo- and color-suppressed decay in a data sample of 386x10(6) B (B) over bar events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe 55 +/- 10 signal events with a statistical significance of 6.3 sigma including systematic uncertainties. The measured branching fraction and charge-asymmetry is B(B-+/-->chi(c1)pi(+/-))=(2.2 +/- 0.4 +/- 0.3)x10(-5) and A(pi)=0.07 +/- 0.18 +/- 0.02, respectively. We also determine the ratio B(B-+/-->chi(c1)pi(+/-))/B(B-+/-->chi K-c1(+/-))=(4.3 +/- 0.8 +/- 0.3)%.

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