Evidence for direct CP violation in B0-->K+pi- decays

Y Chao; P Chang; K Abe; K Abe; N Abe; I Adachi; H Aihara; K Akai; M Akatsu; M Akemoto; Y Asano; T Aso; V Aulchenko; T Aushev; T Aziz; S Bahinipati; A M Bakich; Y Ban; M Barbero; A Bay; I Bedny; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; M-C Chang; A Chen; K-F Chen; W T Chen; B G Cheon; R Chistov; S-K Choi; Y Choi; Y K Choi; A Chuvikov; S Cole; M Danilov; M Dash; L Y Dong; R Dowd; J Dragic; A Drutskoy; S Eidelman; V Eiges; Y Enari; D Epifanov; C W Everton; F Fang; J Flanagan; S Fratina; H Fujii; Y Funakoshi; K Furukawa; N Gabyshev; A Garmash; T Gershon; A Go; G Gokhroo; B Golob; M Grosse Perdekamp; H Guler; R Guo; J Haba; C Hagner; F Handa; K Hara; T Hara; N C Hastings; K Hasuko; K Hayasaka; H Hayashii; M Hazumi; E M Heenan; I Higuchi; T Higuchi; L Hinz; T Hojo; T Hokuue; Y Hoshi; K Hoshina; S Hou; W-S Hou; Y B Hsiung; H-C Huang; T Igaki; Y Igarashi; T Iijima; H Ikeda; A Imoto; K Inami; A Ishikawa; H Ishino; K Itoh; R Itoh; M Iwamoto; M Iwasaki; Y Iwasaki; R Kagan; H Kakuno; T Kamitani; J H Kang; J S Kang; P Kapusta; S U Kataoka; N Katayama; H Kawai; H Kawai; Y Kawakami; N Kawamura; T Kawasaki; N Kent; H R Khan; A Kibayashi; H Kichimi; M Kikuchi; E Kikutani; H J Kim; H O Kim; Hyunwoo Kim; J H Kim; S K Kim; T H Kim; K Kinoshita; S Kobayashi; H Koiso; P Koppenburg; S Korpar; P Krizan; P Krokovny; T Kubo; R Kulasiri; S Kumar; C C Kuo; H Kurashiro; E Kurihara; A Kusaka; A Kuzmin; Y-J Kwon; J S Lange; G Leder; S E Lee; S H Lee; Y-J Lee; T Lesiak; J Li; A Limosani; S-W Lin; D Liventsev; J MacNaughton; G Majumder; F Mandl; D Marlow; M Masuzawa; T Matsuishi; H Matsumoto; S Matsumoto; T Matsumoto; A Matyja; S Michizono; Y Mikami; T Mimashi; W Mitaroff; K Miyabayashi; Y Miyabayashi; H Miyake; H Miyata; R Mizuk; D Mohapatra; G R Moloney; G F Moorhead; T Mori; J Mueller; A Murakami; T Nagamine; Y Nagasaka; T Nakadaira; I Nakamura; T T Nakamura; E Nakano; M Nakao; H Nakayama; H Nakazawa; Z Natkaniec; K Neichi; S Nishida; O Nitoh; S Noguchi; T Nozaki; A Ogawa; S Ogawa; Y Ogawa; K Ohmi; Y Ohnishi; T Ohshima; N Ohuchi; K Oide; T Okabe; S Okuno; S L Olsen; Y Onuki; W Ostrowicz; H Ozaki; P Pakhlov; H Palka; C W Park; H Park; K S Park; N Parslow; L S Peak; M Pernicka; J-P Perroud; M Peters; L E Piilonen; A Poluektov; F J Ronga; N Root; M Rozanska; H Sagawa; M Saigo; S Saitoh; Y Sakai; H Sakamoto; H Sakaue; T R Sarangi; M Satapathy; N Sato; T Schietinger; O Schneider; J Schümann; C Schwanda; A J Schwartz; T Seki; S Semenov; K Senyo; Y Settai; R Seuster; M E Sevior; T Shibata; H Shibuya; T Shidara; B Shwartz; V Sidorov; V Siegle; J B Singh; A Somov; N Soni; R Stamen; S Stanic; M Staric; R Sugahara; A Sugi; T Sugimura; A Sugiyama; K Sumisawa; T Sumiyoshi; S Suzuki; S Y Suzuki; S K Swain; O Tajima; F Takasaki; K Tamai; N Tamura; K Tanabe; M Tanaka; M Tawada; G N Taylor; Y Teramoto; X C Tian; S Tokuda; S N Tovey; K Trabelsi; T Tsuboyama; T Tsukamoto; K Uchida; S Uehara; T Uglov; K Ueno; Y Unno; S Uno; Y Ushiroda; G Varner; K E Varvell; S Villa; C C Wang; C H Wang; J G Wang; M-Z Wang; M Watanabe; Y Watanabe; L Widhalm; Q L Xie; B D Yabsley; A Yamaguchi; H Yamamoto; N Yamamoto; S Yamamoto; T Yamanaka; Y Yamashita; M Yamauchi; Heyoung Yang; P Yeh; J Ying; K Yoshida; M Yoshida; Y Yuan; Y Yusa; H Yuta; S L Zang; C C Zhang; J Zhang; L M Zhang; Z P Zhang; Y Zheng; V Zhilich; T Ziegler; D Zontar; D Zürcher; Belle Collaboration

doi:10.1103/PhysRevLett.93.191802

Evidence for direct CP violation in B0-->K+pi- decays

Phys Rev Lett. 2004 Nov 5;93(19):191802. doi: 10.1103/PhysRevLett.93.191802. Epub 2004 Nov 5.

Authors

Y Chao¹, P Chang, K Abe, K Abe, N Abe, I Adachi, H Aihara, K Akai, M Akatsu, M Akemoto, Y Asano, T Aso, V Aulchenko, T Aushev, T Aziz, S Bahinipati, A M Bakich, Y Ban, M Barbero, A Bay, I Bedny, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, M-C Chang, A Chen, K-F Chen, W T Chen, B G Cheon, R Chistov, S-K Choi, Y Choi, Y K Choi, A Chuvikov, S Cole, M Danilov, M Dash, L Y Dong, R Dowd, J Dragic, A Drutskoy, S Eidelman, V Eiges, Y Enari, D Epifanov, C W Everton, F Fang, J Flanagan, S Fratina, H Fujii, Y Funakoshi, K Furukawa, N Gabyshev, A Garmash, T Gershon, A Go, G Gokhroo, B Golob, M Grosse Perdekamp, H Guler, R Guo, J Haba, C Hagner, F Handa, K Hara, T Hara, N C Hastings, K Hasuko, K Hayasaka, H Hayashii, M Hazumi, E M Heenan, I Higuchi, T Higuchi, L Hinz, T Hojo, T Hokuue, Y Hoshi, K Hoshina, S Hou, W-S Hou, Y B Hsiung, H-C Huang, T Igaki, Y Igarashi, T Iijima, H Ikeda, A Imoto, K Inami, A Ishikawa, H Ishino, K Itoh, R Itoh, M Iwamoto, M Iwasaki, Y Iwasaki, R Kagan, H Kakuno, T Kamitani, J H Kang, J S Kang, P Kapusta, S U Kataoka, N Katayama, H Kawai, H Kawai, Y Kawakami, N Kawamura, T Kawasaki, N Kent, H R Khan, A Kibayashi, H Kichimi, M Kikuchi, E Kikutani, H J Kim, H O Kim, Hyunwoo Kim, J H Kim, S K Kim, T H Kim, K Kinoshita, S Kobayashi, H Koiso, P Koppenburg, S Korpar, P Krizan, P Krokovny, T Kubo, R Kulasiri, S Kumar, C C Kuo, H Kurashiro, E Kurihara, A Kusaka, A Kuzmin, Y-J Kwon, J S Lange, G Leder, S E Lee, S H Lee, Y-J Lee, T Lesiak, J Li, A Limosani, S-W Lin, D Liventsev, J MacNaughton, G Majumder, F Mandl, D Marlow, M Masuzawa, T Matsuishi, H Matsumoto, S Matsumoto, T Matsumoto, A Matyja, S Michizono, Y Mikami, T Mimashi, W Mitaroff, K Miyabayashi, Y Miyabayashi, H Miyake, H Miyata, R Mizuk, D Mohapatra, G R Moloney, G F Moorhead, T Mori, J Mueller, A Murakami, T Nagamine, Y Nagasaka, T Nakadaira, I Nakamura, T T Nakamura, E Nakano, M Nakao, H Nakayama, H Nakazawa, Z Natkaniec, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, A Ogawa, S Ogawa, Y Ogawa, K Ohmi, Y Ohnishi, T Ohshima, N Ohuchi, K Oide, T Okabe, S Okuno, S L Olsen, Y Onuki, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, C W Park, H Park, K S Park, N Parslow, L S Peak, M Pernicka, J-P Perroud, M Peters, L E Piilonen, A Poluektov, F J Ronga, N Root, M Rozanska, H Sagawa, M Saigo, S Saitoh, Y Sakai, H Sakamoto, H Sakaue, T R Sarangi, M Satapathy, N Sato, T Schietinger, O Schneider, J Schümann, C Schwanda, A J Schwartz, T Seki, S Semenov, K Senyo, Y Settai, R Seuster, M E Sevior, T Shibata, H Shibuya, T Shidara, B Shwartz, V Sidorov, V Siegle, J B Singh, A Somov, N Soni, R Stamen, S Stanic, M Staric, R Sugahara, A Sugi, T Sugimura, A Sugiyama, K Sumisawa, T Sumiyoshi, S Suzuki, S Y Suzuki, S K Swain, O Tajima, F Takasaki, K Tamai, N Tamura, K Tanabe, M Tanaka, M Tawada, G N Taylor, Y Teramoto, X C Tian, S Tokuda, S N Tovey, K Trabelsi, T Tsuboyama, T Tsukamoto, K Uchida, S Uehara, T Uglov, K Ueno, Y Unno, S Uno, Y Ushiroda, G Varner, K E Varvell, S Villa, C C Wang, C H Wang, J G Wang, M-Z Wang, M Watanabe, Y Watanabe, L Widhalm, Q L Xie, B D Yabsley, A Yamaguchi, H Yamamoto, N Yamamoto, S Yamamoto, T Yamanaka, Y Yamashita, M Yamauchi, Heyoung Yang, P Yeh, J Ying, K Yoshida, M Yoshida, Y Yuan, Y Yusa, H Yuta, S L Zang, C C Zhang, J Zhang, L M Zhang, Z P Zhang, Y Zheng, V Zhilich, T Ziegler, D Zontar, D Zürcher; Belle Collaboration

Affiliation

¹ Department of Physics, National Taiwan University, Taipei.

PMID: 15600826
DOI: 10.1103/PhysRevLett.93.191802

Abstract

We report evidence for direct CP violation in the decay B0-->K+pi(-) with 253 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. Using 275x10(6) BB 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.