Measurement of B⁰ to J/psi η⁽{}'{}⁾ and Constraint on the η-η' Mixing Angle

M.-C. Chang , Y.-C. Duh , J.-Y. Lin , I. Adachi , K. Adamczyk , H. Aihara , D. M. Asner , T. Aushev

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A. M. Bakich V. Bhardwaj B. Bhuyan A. Bondar A. Bozek M. Bracko J. Brodzicka T. E. Browder P. Chang A. Chen K.-F. Chen P. Chen B. G. Cheon K. Chilikin R. Chistov I.-S. Cho S.-K. Choi Y. Choi J. Dalseno Z. Dolezal Z. Drasal A. Drutskoy S. Eidelman J. E. Fast V. Gaur A. Garmash Y. M. Goh B. Golob J. Haba T. Hara K. Hayasaka H. Hayashii Y. Horii Y. Hoshi W.-S. Hou H. J. Hyun T. Iijima A. Ishikawa R. Itoh M. Iwabuchi Y. Iwasaki T. Iwashita T. Julius N. Katayama T. Kawasaki H. O. Kim J. B. Kim K. T. Kim M. J. Kim Y. J. Kim K. Kinoshita B. R. Ko S. Koblitz P. Kodys S. Korpar P. Krizan P. Krokovny T. Kuhr R. Kumar T. Kumita Y.-J. Kwon J. S. Lange S.-H. Lee J. Li Y. Li J. Libby C. Liu Z. Q. Liu R. Louvot S. McOnie K. Miyabayashi H. Miyata Y. Miyazaki R. Mizuk G. B. Mohanty A. Moll N. Muramatsu Y. Nagasaka I. Nakamura E. Nakano M. Nakao H. Nakazawa Z. Natkaniec S. Nishida K. Nishimura O. Nitoh S. Ogawa T. Ohshima S. Okuno S. L. Olsen G. Pakhlova C. W. Park K. S. Park T. K. Pedlar T. Peng R. Pestotnik M. Petric L. E. Piilonen M. Rohrken S. Ryu H. Sahoo K. Sakai Y. Sakai O. Schneider C. Schwanda A. J. Schwartz K. Senyo M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu A. Sibidanov F. Simon P. Smerkol Y.-S. Sohn A. Sokolov E. Solovieva S. Stanic M. Staric M. Sumihama T. Sumiyoshi S. Tanaka G. Tatishvili Y. Teramoto M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov G. Varner V. Vorobyev C. H. Wang M.-Z. Wang P. Wang Y. Watanabe K. M. Williams E. Won H. Yamamoto Y. Yamashita C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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classification ✦ hep-ex

keywords timesanglebellebranchingconfidenceeta-fractionslevel

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We measure the branching fractions of $B^{0} \to J/\psi \eta^{(}{}'{}^{)}$ decays with the complete Belle data sample of $772 \times 10^{6}$ $B\bar{B}$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The results for the branching fractions are: ${\cal B}(B^{0} \to J/\psi \eta)=(12.3 \pm ^{1.8}_{1.7} \pm 0.7) \times 10^{-6}$ and ${\cal B}(B^{0} \to J/\psi\eta') < 7.4 \times 10^{-6}$ at 90% confidence level. The $\eta-\eta'$ mixing angle is constrained to be less than $ 42.2^{\circ}$ at 90% confidence level.

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Measurement of B⁰ to J/psi η⁽{}'{}⁾ and Constraint on the η-η' Mixing Angle

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