| Literature DB >> 19905747 |
J-T Wei1, P Chang, I Adachi, H Aihara, V Aulchenko, T Aushev, A M Bakich, V Balagura, E Barberio, A Bondar, A Bozek, M Bracko, T E Browder, Y-W Chang, Y Chao, A Chen, K-F Chen, B G Cheon, C-C Chiang, I-S Cho, Y Choi, J Dalseno, A Drutskoy, W Dungel, S Eidelman, N Gabyshev, P Goldenzweig, B Golob, H Ha, B-Y Han, K Hayasaka, H Hayashii, M Hazumi, Y Horii, Y Hoshi, W-S Hou, H J Hyun, T Iijima, K Inami, R Itoh, M Iwasaki, Y Iwasaki, D H Kah, H Kaji, J H Kang, P Kapusta, N Katayama, T Kawasaki, H Kichimi, H J Kim, H O Kim, S K Kim, Y I Kim, Y J Kim, K Kinoshita, B R Ko, S Korpar, P Krizan, P Krokovny, A Kuzmin, Y-J Kwon, S-H Kyeong, J S Lange, M J Lee, S E Lee, T Lesiak, J Li, A Limosani, C Liu, D Liventsev, R Louvot, F Mandl, A Matyja, S McOnie, T Medvedeva, K Miyabayashi, H Miyata, Y Miyazaki, R Mizuk, E Nakano, M Nakao, H Nakazawa, Z Natkaniec, S Nishida, K Nishimura, O Nitoh, T Nozaki, S Ogawa, T Ohshima, S Okuno, H Ozaki, G Pakhlova, C W Park, H Park, H K Park, K S Park, L E Piilonen, M Rozanska, H Sahoo, K Sakai, Y Sakai, O Schneider, C Schwanda, A J Schwartz, R Seidl, A Sekiya, K Senyo, M E Sevior, M Shapkin, C P Shen, J-G Shiu, B Shwartz, S Stanic, M Staric, T Sumiyoshi, S Suzuki, M Tanaka, G N Taylor, Y Teramoto, K Trabelsi, S Uehara, T Uglov, Y Unno, S Uno, P Urquijo, Y Usov, G Varner, K E Varvell, K Vervink, C C Wang, C H Wang, M-Z Wang, P Wang, X L Wang, Y Watanabe, R Wedd, J Wicht, E Won, B D Yabsley, Y Yamashita, M Yamauchi, C Z Yuan, Z P Zhang, T Zivko, A Zupanc, O Zyukova.
Abstract
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.Entities:
Year: 2009 PMID： 19905747 DOI： 10.1103/PhysRevLett.103.171801
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161