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

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

Y Chao  1 , 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
Affiliations

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

Y Chao et al. Phys Rev Lett. .

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.

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