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We report the observation of a near-threshold enhancement in the omega-J/psiinvariant mass distribution for exclusive B-->K omega J/psi decays. The resultsare obtained from a 253 fb-1 data sample that contains 275 million BB-bar mesonpairs that were collected near the Upsilon(4S) resonance with the Belledetector at the KEKB asymmetric energy e+e- collider. The statisticalsignificance of the omega-J/psi mass enhancement is estimated to be greaterthan 8 sigma.Comment: 12 pages, 4 figures, submitted to Physical Review Letter

physical review letters

Observation of a Near-Threshold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>Mass Enhancement in Exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>K</mml:mi><mml:mi>ω</mml:mi><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>Decays

Observation of a Near-ThresholdωJ/ψMass Enhancement in ExclusiveB→KωJ/ψDecays