Evidence for B- -> Ds+ K- l- nubar and search for B- -> Ds*+ K- l- nubar
Abstract
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.
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Cite
@article{arxiv.1207.6244,
title = {Evidence for B- -> Ds+ K- l- nubar and search for B- -> Ds*+ K- l- nubar},
author = {Belle Collaboration and J. Stypula and M. Rozanska and I. Adachi and K. Adamczyk and H. Aihara and D. M. Asner and T. Aushev and A. M. Bakich and V. Bhardwaj and B. Bhuyan and M. Bischofberger and A. Bondar and G. Bonvicini and A. Bozek and M. Bra\v and T. E. Browder and M. -C. Chang and P. Chang and V. Chekelian and A. Chen and P. Chen and B. G. Cheon and R. Chistov and I. -S. Cho and K. Cho and Y. Choi and J. Dalseno and M. Danilov and J. Dingfelder and Z. Dole\v and Z. Drásal and A. Drutskoy and S. Eidelman and H. Farhat and J. E. Fast and V. Gaur and N. Gabyshev and R. Gillard and Y. M. Goh and B. Golob and J. Haba and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and W. -S. Hou and Y. B. Hsiung and H. J. Hyun and T. Iijima and K. Inami and A. Ishikawa and R. Itoh and M. Iwabuchi and Y. Iwasaki and T. Julius and J. H. Kang and P. Kapusta and T. Kawasaki and H. Kichimi and C. Kiesling and H. J. Kim and J. B. Kim and J. H. Kim and K. T. Kim and Y. J. Kim and K. Kinoshita and B. R. Ko and P. Kody\v and S. Korpar and R. T. Kouzes and P. Kri\v and P. Krokovny and T. Kuhr and T. Kumita and A. Kuzmin and Y. -J. Kwon and S. -H. Lee and J. Li and Y. Li and J. Libby and C. Liu and Y. Liu and Z. Q. Liu and D. Liventsev and R. Louvot and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and G. B. Mohanty and A. Moll and N. Muramatsu and E. Nakano and M. Nakao and Z. Natkaniec and C. Ng and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and S. L. Olsen and Y. Onuki and P. Pakhlov and G. Pakhlova and C. W. Park and H. Park and H. K. Park and T. K. Pedlar and R. Pestotnik and M. Petri\v and L. E. Piilonen and M. Ritter and M. Röhrken and S. Ryu and H. Sahoo and Y. Sakai and S. Sandilya and D. Santel and T. Sanuki and Y. Sato and O. Schneider and C. Schwanda and K. Senyo and O. Seon and M. E. Sevior and M. Shapkin and C. P. Shen and T. -A. Shibata and J. -G. Shiu and A. Sibidanov and F. Simon and P. Smerkol and Y. -S. Sohn and A. Sokolov and E. Solovieva and S. Stani\v and M. Stari\v and M. Sumihama and T. Sumiyoshi and Y. Teramoto and M. Uchida and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and P. Vanhoefer and G. Varner and K. E. Varvell and V. Vorobyev and P. Wang and X. L. Wang and M. Watanabe and Y. Watanabe and J. Wiechczynski and K. M. Williams and E. Won and B. D. Yabsley and H. Yamamoto and Y. Yamashita and Z. P. Zhang and V. Zhilich and V. Zhulanov and A. Zupanc},
journal= {arXiv preprint arXiv:1207.6244},
year = {2015}
}
Comments
Submitted to Phys. Rev. D