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Phys. Rev. Lett. 103, 171801 (2009) [6 pages]

Measurement of the Differential Branching Fraction and Forward-Backward Asymmetry for B-->K(*)l+l-

J.-T. Wei,25 P. Chang,25 I. Adachi,8 H. Aihara,41 V. Aulchenko,1,30 T. Aushev,17,12 A. M. Bakich,37 V. Balagura,12 E. Barberio,20 A. Bondar,1,30 A. Bozek,26 M. Bračko,19,13 T. E. Browder,7 Y.-W. Chang,25 Y. Chao,25 A. Chen,23 K.-F. Chen,25 B. G. Cheon,6 C.-C. Chiang,25 I.-S. Cho,45 Y. Choi,36 J. Dalseno,8 A. Drutskoy,2 W. Dungel,10 S. Eidelman,1,30 N. Gabyshev,1,30 P. Goldenzweig,2 B. Golob,18,13 H. Ha,15 B.-Y. Han,15 K. Hayasaka,21 H. Hayashii,22 M. Hazumi,8 Y. Horii,40 Y. Hoshi,39 W.-S. Hou,25 H. J. Hyun,16 T. Iijima,21 K. Inami,21 R. Itoh,8 M. Iwasaki,41 Y. Iwasaki,8 D. H. Kah,16 H. Kaji,21 J. H. Kang,45 P. Kapusta,26 N. Katayama,8 T. Kawasaki,28 H. Kichimi,8 H. J. Kim,16 H. O. Kim,16 S. K. Kim,35 Y. I. Kim,16 Y. J. Kim,5 K. Kinoshita,2 B. R. Ko,15 S. Korpar,19,13 P. Križan,18,13 P. Krokovny,8 A. Kuzmin,1,30 Y.-J. Kwon,45 S.-H. Kyeong,45 J. S. Lange,4 M. J. Lee,35 S. E. Lee,35 T. Lesiak,26,3 J. Li,7 A. Limosani,20 C. Liu,34 D. Liventsev,12 R. Louvot,17 F. Mandl,10 A. Matyja,26 S. McOnie,37 T. Medvedeva,12 K. Miyabayashi,22 H. Miyata,28 Y. Miyazaki,21 R. Mizuk,12 E. Nakano,31 M. Nakao,8 H. Nakazawa,23 Z. Natkaniec,26 S. Nishida,8 K. Nishimura,7 O. Nitoh,43 T. Nozaki,8 S. Ogawa,38 T. Ohshima,21 S. Okuno,14 H. Ozaki,8 G. Pakhlova,12 C. W. Park,36 H. Park,16 H. K. Park,16 K. S. Park,36 L. E. Piilonen,44 M. Rozanska,26 H. Sahoo,7 K. Sakai,28 Y. Sakai,8 O. Schneider,17 C. Schwanda,10 A. J. Schwartz,2 R. Seidl,32 A. Sekiya,22 K. Senyo,21 M. E. Sevior,20 M. Shapkin,11 C. P. Shen,7 J.-G. Shiu,25 B. Shwartz,1,30 S. Stanič,29 M. Starič,13 T. Sumiyoshi,42 S. Suzuki,33 M. Tanaka,8 G. N. Taylor,20 Y. Teramoto,31 K. Trabelsi,8 S. Uehara,8 T. Uglov,12 Y. Unno,6 S. Uno,8 P. Urquijo,20 Y. Usov,1,30 G. Varner,7 K. E. Varvell,37 K. Vervink,17 C. C. Wang,25 C. H. Wang,24 M.-Z. Wang,25 P. Wang,9 X. L. Wang,9 Y. Watanabe,14 R. Wedd,20 J. Wicht,8 E. Won,15 B. D. Yabsley,37 Y. Yamashita,27 M. Yamauchi,8 C. Z. Yuan,9 Z. P. Zhang,34 T. Zivko,13 A. Zupanc,13 and O. Zyukova1,30

(Belle Collaboration)

1Budker Institute of Nuclear Physics, Novosibirsk
2University of Cincinnati, Cincinnati, Ohio 45221
3T. Kosciuszko Cracow University of Technology, Krakow
4Justus-Liebig-Universität Gießen, Gießen
5The Graduate University for Advanced Studies, Hayama
6Hanyang University, Seoul
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Vienna
11Institute of High Energy Physics, Protvino
12Institute for Theoretical and Experimental Physics, Moscow
13J. Stefan Institute, Ljubljana
14Kanagawa University, Yokohama
15Korea University, Seoul
16Kyungpook National University, Taegu
17École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
18Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
19University of Maribor, Maribor
20University of Melbourne, School of Physics, Victoria 3010
21Nagoya University, Nagoya
22Nara Women's University, Nara
23National Central University, Chung-li
24National United University, Miao Li
25Department of Physics, National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nippon Dental University, Niigata
28Niigata University, Niigata
29University of Nova Gorica, Nova Gorica
30Novosibirsk State University, Novosibirsk
31Osaka City University, Osaka
32RIKEN BNL Research Center, Upton, New York 11973
33Saga University, Saga
34University of Science and Technology of China, Hefei
35Seoul National University, Seoul
36Sungkyunkwan University, Suwon
37University of Sydney, Sydney, New South Wales
38Toho University, Funabashi
39Tohoku Gakuin University, Tagajo
40Tohoku University, Sendai
41Department of Physics, University of Tokyo, Tokyo
42Tokyo Metropolitan University, Tokyo
43Tokyo University of Agriculture and Technology, Tokyo
44IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
45Yonsei University, Seoul

Received 5 April 2009; published 20 October 2009

We study B-->K(*)[script-l]+[script-l]- decays ([script-l]=e, µ) based on a data sample of 657×106 B[overline B] 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 (AFB) as functions of q2=M<sub>[script-l][script-l]</sub><sup>2</sup>c2. The fitted AFB spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are [script B](B-->K*[script-l]+[script-l]-)=(10.7<sub>-1.0</sub><sup>+1.1</sup>±0.9)×10-7 and [script B](B-->K[script-l]+[script-l]-)=(4.8<sub>-0.4</sub><sup>+0.5</sup>±0.3)×10-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios RK*=0.83±0.17±0.08 and RK=1.03±0.19±0.06.

©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.103.171801
DOI: 10.1103/PhysRevLett.103.171801
PACS: 13.20.He; 11.30.Er
  • 13.20.He
    Leptonic/semileptonic/radiative decays of bottom mesons
  • 11.30.Er
    Charge conjugation, parity, time reversal, and other discrete symmetries in particles and fields
  • YEAR: 2009

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