Evidence for B- -&gt; Ds+ K- l- nubar and search for B- -&gt; Ds*+ K- l- nubar
Creators: name: Belle Collaboration
name: Stypula, J.
name: Rozanska, M.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Asner, D. M.
name: Aushev, T.
name: Bakich, A. M.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bischofberger, M.
name: Bondar, A.
name: Bonvicini, G.
name: Bozek, A.
name: Bra\v, M.
name: Browder, T. E.
name: Chang, M. -C.
name: Chang, P.
name: Chekelian, V.
name: Chen, A.
name: Chen, P.
name: Cheon, B. G.
name: Chistov, R.
name: Cho, I. -S.
name: Cho, K.
name: Choi, Y.
name: Dalseno, J.
name: Danilov, M.
name: Dingfelder, J.
name: Dole\v, Z.
name: Drásal, Z.
name: Drutskoy, A.
name: Eidelman, S.
name: Farhat, H.
name: Fast, J. E.
name: Gaur, V.
name: Gabyshev, N.
name: Gillard, R.
name: Goh, Y. M.
name: Golob, B.
name: Haba, J.
name: Hayasaka, K.
name: Hayashii, H.
name: Horii, Y.
name: Hoshi, Y.
name: Hou, W. -S.
name: Hsiung, Y. B.
name: Hyun, H. J.
name: Iijima, T.
name: Inami, K.
name: Ishikawa, A.
name: Itoh, R.
name: Iwabuchi, M.
name: Iwasaki, Y.
name: Julius, T.
name: Kang, J. H.
name: Kapusta, P.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, H. J.
name: Kim, J. B.
name: Kim, J. H.
name: Kim, K. T.
name: Kim, Y. J.
name: Kinoshita, K.
name: Ko, B. R.
name: Kody\v, P.
name: Korpar, S.
name: Kouzes, R. T.
name: Kri\v, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lee, S. -H.
name: Li, J.
name: Li, Y.
name: Libby, J.
name: Liu, C.
name: Liu, Y.
name: Liu, Z. Q.
name: Liventsev, D.
name: Louvot, R.
name: Miyabayashi, K.
name: Miyata, H.
name: Miyazaki, Y.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moll, A.
name: Muramatsu, N.
name: Nakano, E.
name: Nakao, M.
name: Natkaniec, Z.
name: Ng, C.
name: Nishida, S.
name: Nishimura, K.
name: Nitoh, O.
name: Nozaki, T.
name: Ogawa, S.
name: Ohshima, T.
name: Okuno, S.
name: Olsen, S. L.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Petri\v, M.
name: Piilonen, L. E.
name: Ritter, M.
name: Röhrken, M.
name: Ryu, S.
name: Sahoo, H.
name: Sakai, Y.
name: Sandilya, S.
name: Santel, D.
name: Sanuki, T.
name: Sato, Y.
name: Schneider, O.
name: Schwanda, C.
name: Senyo, K.
name: Seon, O.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Sibidanov, A.
name: Simon, F.
name: Smerkol, P.
name: Sohn, Y. -S.
name: Sokolov, A.
name: Solovieva, E.
name: Stani\v, S.
name: Stari\v, M.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Teramoto, Y.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Usov, Y.
name: Vanhoefer, P.
name: Varner, G.
name: Varvell, K. E.
name: Vorobyev, V.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Watanabe, Y.
name: Wiechczynski, J.
name: Williams, K. M.
name: Won, E.
name: Yabsley, B. D.
name: Yamamoto, H.
name: Yamashita, Y.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report measurements of the decays B- -&gt; 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- -&gt; Ds+ K- l- nubar decay with a significance of 3.4 sigma. We measure the following branching fractions: BF(B- -&gt; Ds+ K- l nubar) = (0.30 +/- 0.09(stat) +0.11 -0.08(syst)) x 10^-3 and BF(B- -&gt; Ds*+ K- l- nubar) = (0.59 +/- 0.12(stat) +/- 0.15(syst)) x 10^-3 and set an upper limit BF(B- -&gt; Ds*+ K- l- nubar) &lt; 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.
description: Submitted to Phys. Rev. D