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arXiv · 1411.2035

Measurement of $B^0 \to D_s^- K^0_Sπ^+$ and $B^+ \to D_s^- K^+K^+$ branching fractions

J. Wiechczynski·J. Stypula·A. Abdesselam·I. Adachi·K. Adamczyk·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·A. M. Bakich·V. Bansal·V. Bhardwaj·B. Bhuyan·A. Bobrov·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·B. G. Cheon·K. Cho·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·J. Dingfelder·Z. Doležal·Z. Drásal·A. Drutskoy·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·O. Frost·V. Gaur·N. Gabyshev·S. Ganguly·A. Garmash·D. Getzkow·R. Gillard·Y. M. Goh·O. Grzymkowska·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·X. H. He·W. -S. Hou·M. Huschle·H. J. Hyun·T. Iijima·A. Ishikawa·R. Itoh·Y. Iwasaki·I. Jaegle·D. Joffe·K. K. Joo·T. Julius·K. H. Kang·E. Kato·T. Kawasaki·H. Kichimi·D. Y. Kim·J. B. Kim·J. H. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·P. Križan·P. Krokovny·T. Kuhr·T. Kumita·A. Kuzmin·Y. -J. Kwon·J. S. Lange·I. S. Lee·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·P. Lukin·D. Matvienko·K. Miyabayashi·H. Miyata·R. Mizuk·G. B. Mohanty·A. Moll·T. Mori·R. Mussa·M. Nakao
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Abstract

We report a measurement of the $B^0$ and $B^+$ meson decays to the $D_s^-K^0_S π^+$ and $D_s^- K^+K^+$ final states, respectively, using $657 \times 10^{6} B\overline{B}$ pairs collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Using the $D_s^-\to ϕπ^-$, $K^{*}(892)^0 K^-$ and $K^0_S K^-$ decay modes for the $D_s$ reconstruction, we measure the following branching fractions: ${\cal B}(B^0\to D_s^{-}K^0_Sπ^+)=[0.47 \pm 0.06 (\mathrm {stat}) \pm 0.05 (\mathrm {syst})]\times 10^{-4}$ and ${\cal B}(B^+\to D_s^-K^+K^+)= [0.93 \pm 0.22 (\mathrm {stat})\pm 0.10 (\mathrm {syst})]\times 10^{-5}$. We find the ratio of the branching fraction of $B^+\to D_s^-K^+K^+$ to that of the analogous Cabibbo favored $B^+\to D_s^-K^+π^+$ decay to be ${\cal R}_{\cal B} = 0.054 \pm 0.013 ({\rm stat}) \pm 0.006 ({\rm syst})$, which is consistent with the na\"ıve factorization model. We also observe a deviation from the three-body phase-space model for both studied decays.

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J. Wiechczynski, J. Stypula, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, V. Bhardwaj, B. Bhuyan, A. Bobrov, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, B. G. Cheon, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Z. Drásal, A. Drutskoy, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, D. Getzkow, R. Gillard, Y. M. Goh, O. Grzymkowska, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, X. H. He, W. -S. Hou, M. Huschle, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, H. Kichimi, D. Y. Kim, J. B. Kim, J. H. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange, I. S. Lee, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, T. Mori, R. Mussa, M. Nakao. 2014-11-07. Measurement of $B^0 \to D_s^- K^0_Sπ^+$ and $B^+ \to D_s^- K^+K^+$ branching fractions. https://doi.org/10.1103/physrevd.91.032008

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