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| 題名: | Evidence for B -→Ds+K -ℓ -ν ̄ℓ and search for B -→Ds*+K -ℓ -ν ̄ℓ |
| 作者: | 陳鎰鋒;Sakai, Y.;Kim, H. J.;Nozaki, T.;Asner, D. M.;Shwartz, B.A.;Bonvicini, G.;Kichimi, H.;Liu, Yueh-Feng;Liventsev, D.;Kawasaki, T.;Kim, Jung-Hyun;Zupanc, Anze;Louvot, R.;Yamashita, Y.;Danilov, M.;Liu, Z. Q.;Gillard, R.;Julius, T.;Cheon, B. G.;Uno, S.;Watanabe, M.;Bhardwaj, V.;Hsiung, Y. B.;Yabsley, Bruce;Kody, P.;Kim, Yongsun;Uglov, T.;Nishida, S.;Itoh, R.;Hyun, H. J.;Moll, A.;Shapkin, M.;Lee, S. H.;Park, H.;Uchida, M.;Kuhr, T.;Schwanda, C.;Varner, G.;Adamczyk, K.;Kiesling, C.;Chen, A.;Ng, C.;Santel, D.;Piilonen, Leo;Drutskoy, A.;Iwasaki, Y.;Liu, Chang;Bondar, A.E.;Senyo, K.;Pedlar, T. K.;Adachi, I.;Ritter, M.;Ko, B. R.;Onuki, Y.;Olsen, S. L.;Chang, M. C.;Zhilich, V.;Hayashii, H.;Chistov, R.;Fast, James E.;Pakhlov, P.;Vorobyev, V.;Bračko, M.;Farhat, H.;Bakich, A. M.;Usov, Y.;Kumita, T.;Seon, O.;Kim, K. T.;Kwon, Y. J.;Iwabuchi, M.;Chang, P.;Solovieva, E.;Chen, Po-Hsun;Browder, T. E.;Starič, M.;Kapusta, P.;Ogawa, S.;Gabyshev, N.;Ohshima, T.;Miyata, H.;Bozek, A.;Gaur, V.;Miyabayashi, K.;Sibidanov, A.L.;Wang, P.;Ishikawa, A.;Sandilya, S.;Korpar, Samo;Watanabe, Y.;Krian, P.;Ryu, Sunmin;Wiechczynski, J.;Sanuki, T.;Aushev, Tagir;Okuno, S.;Drásal, Z.;Sato, Y.;Nishimura, K.;Haba, J. |
| 貢獻者: | 理學院物理學系 |
| 日期: | 2012-10-23 |
| 上傳時間: | 2026-04-23 11:54:02 (UTC+8) |
| 出版者: | American Physical Society;American Physical Society (APS) |
| 摘要: | 摘要： We report measurements of the decays B- -> Ds(*)+ K- l- nubar in a data sample containing 657x10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal with a significance of 6 sigma for the combined Ds and Ds* modes and find the first evidence of the B- -> Ds+ K- l- nubar decay with a significance of 3.4 sigma. We measure the following branching fractions: BF(B- -> Ds+ K- l nubar) = (0.30 +/- 0.09(stat) +0.11 -0.08(syst)) x 10^-3 and BF(B- -> Ds*+ K- l- nubar) = (0.59 +/- 0.12(stat) +/- 0.15(syst)) x 10^-3 and set an upper limit BF(B- -> Ds*+ K- l- nubar) < 0.56 x 10^-3 at the 90% confidence level. We also present the first measurement of the Ds+K- invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6 GeV/c^2.
出版者： American Physical Society (APS)
出版日期： 2012-10-23
出處： Physical Review D, 2012-10, Vol.86
識別號： ISSN: 1550-7998
識別號： EISSN: 1550-2368
識別號： DOI: 10.1103/physrevd.86.072007 |
| 顯示於類別: | [物理學系] 期刊論文
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