Observation of B decays to two kaons

Using 449x10(6) BB[over ] pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, we observe clear signals for B(+)-->K[over ](0)K(+) and B(0)-->K[over ](0)K(0) decays with 5.3sigma and 6.0sigma significance, respectively. We measure the branching fractions B(B...

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Veröffentlicht in:Physical review letters 2007-05, Vol.98 (18), p.181804-181804, Article 181804
Hauptverfasser: Lin, S-W, Chang, P, Abe, K, Adachi, I, Aihara, H, Anipko, D, Arinstein, K, Aulchenko, V, Aushev, T, Aziz, T, Bakich, A M, Barberio, E, Bay, A, Bedny, I, Belous, K, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bracko, M, Chao, Y, Chen, A, Chen, K-F, Chen, W T, Cheon, B G, Chistov, R, Choi, S-K, Choi, Y, Choi, Y K, Dalseno, J, Dash, M, Dragic, J, Eidelman, S, Fratina, S, Gabyshev, N, Gershon, T, Go, A, Gokhroo, G, Golob, B, Ha, H, Haba, J, Hara, T, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Hoshi, Y, Hou, S, Hou, W-S, Hsiung, Y B, Iijima, T, Ikado, K, Imoto, A, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kaji, H, Kang, J H, Katayama, N, Kawai, H, Kawasaki, T, Khan, H R, Kichimi, H, Kim, Y J, Kinoshita, K, Korpar, S, Krizan, P, Kulasiri, R, Kuo, C C, Kwon, Y-J, Lange, J S, Lee, J, Lee, M J, Lee, S E, Lesiak, T, Limosani, A, Mandl, F, Matsumoto, T, McOnie, S, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Mohapatra, D, Mori, T, Nakamura, I, Nakano, E, Nakao, M, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ogawa, S
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Zusammenfassung:Using 449x10(6) BB[over ] pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, we observe clear signals for B(+)-->K[over ](0)K(+) and B(0)-->K[over ](0)K(0) decays with 5.3sigma and 6.0sigma significance, respectively. We measure the branching fractions B(B(+)-->K[over ](0)K(+))=(1.22(-0.28-0.16)(+0.32+0.13))x10(-6) and B(B(0)-->K[over ](0)K(0))=(0.87(-0.20)(+0.25)+/-0.09)x10(-6), and partial-rate asymmetries A(CP)(B(+)-->K[over ](0)K(+))=0.13(-0.24)(+0.23)+/-0.02 and A(CP)(B(0)-->K[over ](0)K(0))=-0.58(-0.66)(+0.73)+/-0.04. From a simultaneous fit, we also obtain B(B(+)-->K(0)pi(+))=(22.8(-0.7)(+0.8)+/-1.3)x10(-6) and A(CP)(B(+)-->K(0)pi(+))=0.03+/-0.03+/-0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B(0)-->K(+)K(-) decays, and for this branching fraction, we set an upper limit of 4.1x10(-7) at the 90% confidence level.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.98.181804