Evidence For Direct Cp Violation In B-0 -> K+Pi(-) Decays

Yuan Chào,Pin Chang,Kazuo Abe,Koya Abe,N. Abe,Ichiro Adachi,Hiroaki Aihara,Kazunori Akai,Mitsuhiro Akatsu,Mitsuo Akemoto,Yûzo Asano,Tsukasa Aso,Vladimir M. Aulchenko,Tagir A Kh Aushev,Tariq Aziz,S. Bahinipati,A. M. Bakich,Yong Ban,Marlon B. Barbero,Aurelio Bay,I. V. Bedny,Urban Bitenc,Ilija Bizjak,S. C. Blyth, Alex E. Bondar, Andrzej Bozek,Marko Bračko,Jolanta Brodzicka,Thomas E. Browder,M. C. Chang,Augustine E. Chen,Kaifeng Chen,Wanting Chen,Byunggu Cheon,Ruslan N. Chistov,Sookyung Choi,Yoonsuk Choi,Youngkyu Choi,A. Chuvikov,S. Cole,Michael V. Danilov,M. Dash,L. Y. Dong,Rohan Dowd,J. Dragic,Alexey G. Drutskoy,Simon I. Eidelman,V. Eiges,Yuji Enari,Denis A. Epifanov,C. W. Everton,Fan Fang,John W. Flanagan,Saša Fratina,Hirofumi Fujii,Yoshihiro Funakoshi,Kazuro Furukawa,N. I. Gabyshev,Alexei Yu Garmash,Tim J. Gershon,Apollo Go,G. Gokhroo,Boštjan Golob,Matthias Große-Perdekamp,Hayg Guler,Rui Guo,Junji Haba,Caren Hagner,F. Handa,Kaoru Y. Hara,Takanori Hara,Nicholas C. Hastings,Kazumi Hasuko,Kiyoshi Hayasaka,Hisaki Hayashii,Masashi Hazumi,E. M. Heenan,I. Higuchi,Takeo Higuchi,Luc Hinz,Takashi Hojo,T. Hokuue,YOSHIMOTO Hoshi,K. Hoshina,Suen Hou,Weishu Hou,Yeebob Hsiung,Hsuancheng Huang,T. Igaki,Youichi Igarashi,Toru Iijima,Hirokazu Ikeda,A. Imoto,Kenji Inami,Akimasa Ishikawa,Hirokazu Ishino,Ko Itoh,Ryosuke Itoh,Mitsumasa Iwamoto,Masahiko Iwasaki, Yoshihito Iwasaki,R. Kagan,Hidekazu Kakuno,Takuya Kamitani,Joohoon Kang,JooSang Kang,Piotr J. Kapusta,S. U. Kataoka,Nobuhiko Katayama,Hideyuki Kawai,Hiroshi Kawai,Yuhsuke Kawakami,Naritoshi Kawamura,Takeo Kawasaki,N. M. Kent,H. R. Khan,A. Kibayashi,Hiromichi Kichimi,Mitsuo Kikuchi,Eiji Kikutani,Hongju Kim,Hyunok Kim, Hyunwoo Kim,J. H. Kim,Sunkee Kim,T. H. Kim,Kay Kinoshita,Shigeharu Kobayashi,Haruyo Koiso,Patrick Koppenburg,Samo Korpar,Peter Križan,Pavel P. Krokovny,T. Kubo,R. Kulasiri,Suneel Kumar, Chiencheng Kuo,H. Kurashiro,E. Kurihara,A. Kusaka,A. S. Kuzmin,Youngjoon Kwon,Jens Sören Lange,Garth D. Leder,Sangeun Lee,Sangho Lee,Yenjie Lee,Tadeusz Lesiak,Jing Li, A. Limosani,Sunwen Lin,D. Liventsev,Jimmy N. Macnaughton, G. Majumder,Franz Mandl,Daniel R. Marlow,Mika Masuzawa,T. Matsuishi,Hironobu Matsumoto,Shigeo Matsumoto,Toshiro Matsumoto,Adam Tomasz Matyja,Shinichiro Michizono,Y. Mikami,Toshihiro Mimashi,Winfried A. Mitaroff,Kenkichi Miyabayashi,Y. Miyabayashi,Hideki Miyake,Hitoshi Miyata,Roman V. Mizuk,Debabrata K. Mohapatra,Glenn R. Moloney,Gareth F. Moorhead,Toshinori Mori,James A. Mueller,Akira Murakami,Tadashi Nagamine,Yasushi Nagasaka,Takeshi Nakadaira,Isamu Nakamura,Tatsuro Nakamura,Eiichi Nakano,Mikihiko Nakao,Hisayoshi Nakayama,H. Nakazawa,Z. Natkaniec,Kazushi Neichi,Shohei Nishida,Osamu Nitoh,Seishi Noguchi,Tadao Nozaki,Akio Ogawa,Satoru Ogawa,Yujiro Ogawa,Kazuhito Ohmi,Yukiyoshi Ohnishi,Takayoshi Ohshima,Norihito Ohuchi,Katsunobu Oide,T. Okabe,Shoji Okuno,Stephen Lars Olsen,Yoshiyuki Onuki,W. Ostrowicz,Hitoshi Ozaki,P. N. Pakhlov,Henryk Pałka,C. W. Park,H. K. Park,Kyoungsook Park,N. Parslow,L. S. Peak,Manfred Pernicka,J. P. Perroud,Michael W. Peters,Leo E. Piilonen,Anton O. Poluektov,Frédéric J. Ronga,N. I. Root,Maria Róz̀anśka,Hiroyuki Sagawa,M. Saigo,Satoshi Saitoh,Yoshihide Sakai,H. Sakamoto,H. Sakaue,Tapas R. Sarangi,M. Satapathy,Noriaki K. Sato,Thomas Schietinger,Olivier Schneider,J. Schümann,Christoph Schwanda,A. J. Schwartz,T. Seki,Sergey V. Semenov,K. Senyo,Y. Settai,Rolf Seuster,Martin E. Sevior,Tatsunobu Shibata,Hiroshi Shibuya,Tetsuo Shidara,Boris A. Shwartz,Veniamin A. Sidorov,V. Siegle,Jaivir B. Singh,A. M. Somov,Nitesh O. Soni,Rainer Stamen,Samo Stanič,Marko Starič,Ryuhei Sugahara,A. Sugi,Takashi Sugimura,Akira Sugiyama,K. Sumisawa,Takayuki Sumiyoshi,S. Y. Suzuki,Sohyamagata Suzuki,Sanjay K. Swain,Osamu Tajima,Fumihiko Takasaki,Kunio Tamai,Norio Tamura,Kenji Tanabe,Manobu Tanaka,Masafumi Tawada,Geoffrey N. Taylor,Yoshiki Teramoto,X. C. Tian,S. Tokuda,Stuart N. Tovey,Karim Trabelsi,Toru Tsuboyama, Toshifumi Tsukamoto,K. Uchida,Sadaharu Uehara,T. Uglov,Koji Ueno,Yoshinobu Unno,Shoji Uno,Yutaka Ushiroda,Gary S. Varner,Kevin E. Varvell,Stefano Villa,C. C. Wang,Chunghsiang Wang,Jiangui Wang,Hiroshi Wang,Masakazu Watanabe,Yasushi Watanabe,Laurenz Widhalm,Q. L. Xie,Bruce D. Yabsley,Akira Yamaguchi,Hitoshi Yamamoto,Noboru Yamamoto, S. Yamamoto,Taku Yamanaka,Yousuke Yamashita,Masanori Yamauchi,HongXun Yang,Ping Yeh,Jun Ying,K. Yoshida,Makoto Yoshida,Ye Yuan,Yuki Yusa,Haruo Yuta,S. L. Zang,Changchun Zhang,Jian Zhang,Liming Zhang,Ziping Zhang,Yangheng Zheng,Victor N. Zhilich,Th Ziegler,Dejan Žontar,Dario Zürcher

PHYSICAL REVIEW LETTERS（2004）

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摘要

We report evidence for direct CP violation in the decay B-0-->K(+)pi(-) with 253 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. Using 275x10(6) B(B) over bar pairs we observe a B-->K(+/-)pi(-/+) signal with 2140+/-53 events. The measured CP violating asymmetry is A(CP)(K(+)pi(-))=-0.101+/-0.025(stat)+/-0.005(syst), corresponding to a significance of 3.9sigma including systematics. We also search for CP violation in the decays B+-->K(+)pi(0) and B+-->pi(+)pi(0). The measured CP violating asymmetries are A(CP)(K(+)pi(0))=0.04+/-0.05(stat)+/-0.02(syst) and A(CP)(pi(+)pi(0))=-0.02+/-0.10(stat)+/-0.01(syst), corresponding to the intervals -0.05< A(CP)(K(+)pi(0))<0.13 and -0.18< A(CP)(pi(+)pi(0))<0.14 at 90% confidence level.

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