Observation Of Y(3940)-> J/Psi Omega In B -> J/Psi Omega K At Babar
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Mohanty,H. Band,X. Chen,S. Dasu,K. Flood,J. Hollar,P. Kutter,Y. Pan,M. Pierini,R. Prepost,S. Wu,H. Neal
PHYSICAL REVIEW LETTERS（2008）
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摘要
We present a study of the decays B(0,+) -> J/psi omega K(0,+) using 383 x 10(6) B (B) over bar events obtained with the BABAR detector at PEP-II. We observe Y(3940) -> J/psi omega, with mass 3914.6(-3.4)(+3.8)(stat) +/- 2.0(syst) MeV/c(2), and width 34(-8)(+12)(stat) +/- 5(syst) MeV. The ratio of B(0) and B(+) decay to YK is 0.27(-0.23)(+0.28)(stat)(-0.01)(+0.04)(syst), and the relevant B(0) and B(+) branching fractions are reported.
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