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Wei, J-T; Chang, P; Adachi, I; Aulchenko, V; Aushev, T; Bakich, A M; Balagura, V; Barberio, E; Bozek, A; Bracko, M; Browder, T E; Chang, Y-W; Chao, Y; Chen, K-F; Cheon, B G; Chiang, C-C; Cho, I-S; Dalseno, J; Drutskoy, A; Dungel, W; Eidelman, S; Gabyshev, N; Golob, B; Han, B-Y; Hayashii, H; Hazumi, M; Hoshi, Y; Hou, W-S; Hyun, H J; Inami, K; Itoh, R; Iwasaki, M; Iwasaki, Y; Kah, D H; Kaji, H; Kang, J H; Kapusta, P; Katayama, N; Kim, H J; Kim, S K; Kim, Y I; Kinoshita, K; Ko, B R; Korpar, S; Kuzmin, A; Kwon, Y-J; Lee, M J; Lee, S E; Lesiak, T; Liu, C; Louvot, R; Mandl, F; Matyja, A; Miyata, H; Miyazaki, Y; Nakano, E; Nakao, M; Nakazawa, H; Natkaniec, Z; Nishida, S; Nishimura, K; Nitoh, O; Ogawa, S; Ozaki, H; Park, H; Piilonen, L E; Sahoo, H; Sakai, K; Schwanda, C; Schwartz, A J; Sekiya, A; Senyo, K; Sevior, M E; Shapkin, M; Shen, C P; Stanic, S; Staric, M; Sumiyoshi, T; Suzuki, S; Tanaka, M; Taylor, G N; Trabelsi, K; Uglov, T; Unno, Y; Uno, S; Urquijo, P; Varvell, K E; Vervink, K; Wang, C C; Wang, M-Z; Wang, X L; Watanabe, Y; Wedd, R; Wicht, J; Won, E; Yamashita, Y; Yuan, C Z; Zhang, Z P; Zivko, T; Zyukova, O
Physical review letters, 10/2009, Letnik: 103, Številka: 17Journal Article
We study B --> K(*)l+l- decays (l = e, mu) based on a data sample of 657 x 10(6) BB pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (A(FB)) as functions of q2 = M(ll)(2)c2. The fitted A(FB) spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B --> K*l+l-) = (10.7(-1.0)(+1.1) +/- 0.9) x 10(-7) and B(B --> Kl+l-) = (4.8(-0.4)(+0.5) +/- 0.3) x 10(-7), where the first errors are statistical and the second are systematic, with the muon to electron ratios R(K*) = 0.83 +/- 0.17 +/- 0.08 and R(K) = 1.03 +/- 0.19 +/- 0.06.
