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arXiv · 1501.06867

Observation of $X(3872)$ in $B \to X(3872) Kπ$ decays

A. Bala·V. Bhardwaj·K. Trabelsi·J. B. Singh·A. Abdesselam·I. Adachi·H. Aihara·K. Arinstein·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·T. Aziz·S. Bahinipati·A. M. Bakich·V. Bansal·E. Barberio·B. Bhuyan·A. Bobrov·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·A. Chen·B. G. Cheon·R. Chistov·K. Cho·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·J. Dingfelder·Z. Doležal·A. Drutskoy·D. Dutta·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·T. Ferber·O. Frost·V. Gaur·N. Gabyshev·A. Garmash·D. Getzkow·Y. M. Goh·B. Golob·O. Grzymkowska·J. Haba·T. Hara·H. Hayashii·X. H. He·A. Heller·T. Horiguchi·W. -S. Hou·M. Huschle·T. Iijima·A. Ishikawa·R. Itoh·Y. Iwasaki·I. Jaegle·D. Joffe·K. H. Kang·E. Kato·T. Kawasaki·C. Kiesling·D. Y. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·R. Kumar·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. Miyake·H. Miyata·R. Mizuk·G. B. Mohanty·S. Mohanty·A. Moll
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Abstract

We report the first observation of $B^0 \to X(3872) (K^{+}π^{-})$ and evidence for $B^+ \to X(3872) (K^{0}π^{+})$. We measure the product of branching fractions for the former to be ${\cal B}(B^0 \to X(3872) (K^+ π^-)) \times {\cal B}(X(3872) \to J/ψπ^+ π^-) = (7.9 \pm 1.3(\mbox{stat.})\pm 0.4(\mbox{syst.})) \times 10^{-6}$ and find that $B^{0}\to X(3872) K^{*}(892)^{0}$ does not dominate the $B^{0}\to X(3872)K^{+}π^{-}$ decay mode. We also measure ${\cal B}(B^+ \to X(3872) (K^0 π^+)) \times {\cal B}(X(3872) \to J/ψπ^+ π^-) = (10.6 \pm 3.0(\mbox{stat.}) \pm 0.9(\mbox{syst.})) \times 10^{-6}$. This study is based on the full data sample of 711~fb$^{-1}$ ($772\times 10^6 B\bar B$ pairs) collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB collider.

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A. Bala, V. Bhardwaj, K. Trabelsi, J. B. Singh, A. Abdesselam, I. Adachi, H. Aihara, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, T. Aziz, S. Bahinipati, A. M. Bakich, V. Bansal, E. Barberio, B. Bhuyan, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, J. Dingfelder, Z. Doležal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, A. Garmash, D. Getzkow, Y. M. Goh, B. Golob, O. Grzymkowska, J. Haba, T. Hara, H. Hayashii, X. H. He, A. Heller, T. Horiguchi, W. -S. Hou, M. Huschle, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, D. Joffe, K. H. Kang, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, 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. Miyake, H. Miyata, R. Mizuk, G. B. Mohanty, S. Mohanty, A. Moll. 2015-09-10. Observation of $X(3872)$ in $B \to X(3872) Kπ$ decays. https://doi.org/10.1103/physrevd.91.051101

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