Evidence for a narrow near-threshold structure in the J/ψ mass spectrum in B+→J/ψ K+ decays

Evidence is reported for a narrow structure near the J/ψ threshold in exclusive B+→J/ψ K+ decays produced in p̄p collisions at s=1.96TeV. A signal of 14±5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosit...

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Bibliographic Details
Main Authors:	Aaltonen, T, Adelman, J, Akimoto, T, Álvarez González, B, Amerio, S, Amidei, D, Anastassov, A, Annovi, A, Antos, J, Apollinari, G, Apresyan, A, Arisawa, T, Artikov, A, Ashmanskas, W, Attal, A, Aurisano, A, Azfar, F, Badgett, W, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barria, P, Bartsch, V, Bauer, G, Beauchemin, P
Format:	Journal article
Language:	English
Published:	2009

Evidence for a narrow near-threshold structure in the J/ψ mass spectrum in B+→J/ψ K+ decays

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