Evidence for a Narrow Near-Threshold Structure in the J/ψϕ Mass Spectrum in B+→J/ψϕK+ Decays

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URI: http://hdl.handle.net/10902/2003
ISSN: 0031-9007
ISSN: 1079-7114
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Author
Aaltonen, Timo Antero; Akimoto, Takashi; Álvarez González, Bárbara; Amerio, Silvia; Amidei, Dante; Anastassov, Anton; Annovi, Alberto; Antos, Jaroslav; Apollinari, Giorgio; Apresyan, Artur; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío; Arisawa, Tetsuo; [et al.]
Date
2009-06-15
Derechos
© 2009 The American Physical Society
Publicado en
Physical Review Letters, vol. 102, iss. 24, art. num. 242002 (2009)
Publisher
American Physical Society
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Abstract:
Evidence is reported for a narrow structure near the J/ψϕ threshold in exclusive B+→J/ψϕK+ decays produced in p̅ p collisions at √s=1.96  TeV. 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 luminosity of 2.7  fb-1, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0±2.9(stat)±1.2(syst)  MeV/c2 and 11.7-5.0+8.3(stat)±3.7(syst)  MeV/c2.
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