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

  • Wei, J-T.
  • Chang, P.
  • Adachi, I.
  • Aihara, H.
  • Aulchenko, V.
  • ... Cheon, B. G.
  • 외 140명
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319
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476

초록

We study B -> Kd(*)l(+)l(-) decays (l = e,u) based on a data sample of 657 x 10(6) B (B) over bar 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 q(2) = M(ll)(2)c(2). 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)) x 10(-7) and B(B -> Kl(+)l(-)) = (4.8 (+0.5)(-0.4) +/- 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.

키워드

DECAYSBELLEMODEL
제목
Measurement of the Differential Branching Fraction and Forward-Backward Asymmetry for B -> K((*))l(+) l(-)
저자
Wei, J-T.Chang, P.Adachi, I.Aihara, H.Aulchenko, V.Aushev, T.Bakich, A. M.Balagura, V.Barberio, E.Bondar, A.Bozek, A.Bracko, M.Browder, T. E.Chang, Y-W.Chao, Y.Chen, A.Chen, K-F.Cheon, B. G.Chiang, C-C.Cho, I-S.Choi, Y.Dalseno, J.Drutskoy, A.Dungel, W.Eidelman, S.Gabyshev, N.Goldenzweig, P.Golob, B.Ha, H.Han, B-Y.Hayasaka, K.Hayashii, H.Hazumi, M.Horii, Y.Hoshi, Y.Hou, W-S.Hyun, H. J.Iijima, T.Inami, K.Itoh, R.Iwasaki, M.Iwasaki, Y.Kah, D. H.Kaji, H.Kang, J. H.Kapusta, P.Katayama, N.Kawasaki, T.Kichimi, H.Kim, H. J.Kim, H. O.Kim, S. K.Kim, Y. I.Kim, Y. J.Kinoshita, K.Ko, B. R.Korpar, S.Krizan, P.Krokovny, P.Kuzmin, A.Kwon, Y-J.Kyeong, S-H.Lange, J. S.Lee, M. J.Lee, S. E.Lesiak, T.Li, J.Limosani, A.Liu, C.Liventsev, D.Louvot, R.Mandl, F.Matyja, A.McOnie, S.Medvedeva, T.Miyabayashi, K.Miyata, H.Miyazaki, Y.Mizuk, R.Nakano, E.Nakao, M.Nakazawa, H.Natkaniec, Z.Nishida, S.Nishimura, K.Nitoh, O.Nozaki, T.Ogawa, S.Ohshima, T.Okuno, S.Ozaki, H.Pakhlova, G.Park, C. W.Park, H.Park, H. K.Park, K. S.Piilonen, L. E.Rozanska, M.Sahoo, H.Sakai, K.Sakai, Y.Schneider, O.Schwanda, C.Schwartz, A. J.Seidl, R.Sekiya, A.Senyo, K.Sevior, M. E.Shapkin, M.Shen, C. P.Shiu, J-G.Shwartz, B.Stanic, S.Staric, M.Sumiyoshi, T.Suzuki, S.Tanaka, M.Taylor, G. N.Teramoto, Y.Trabelsi, K.Uehara, S.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Varner, G.Varvell, K. E.Vervink, K.Wang, C. C.Wang, C. H.Wang, M-Z.Wang, P.Wang, X. L.Watanabe, Y.Wedd, R.Wicht, J.Won, E.Yabsley, B. D.Yamashita, Y.Yamauchi, M.Yuan, C. Z.Zhang, Z. P.Zivko, T.Zupanc, A.Zyukova, O.
DOI
10.1103/PhysRevLett.103.171801
발행일
2009-10
유형
Article
저널명
Physical Review Letters
103
17
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