Evidence for a Narrow Near-Threshold Structure in the J/ psi phi Mass Spectrum in B+-->J/ psi phi K+ Decays
Author(s)Xie, Si; Henderson, C.; Hahn, Kristian Allan; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Knuteson, Bruce O.; Choudalakis, Georgios; Makhoul, K.; Bauer, Gerry P.; Paus, Christoph M. E.; ... Show more Show less
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Evidence is reported for a narrow structure near the J/ψϕ threshold in exclusive B+→J/ψϕK+ decays produced in (p)over-bar 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/c[superscript 2] and 11.7[subscript -5.0] [superscript +8.3](stat)±3.7(syst) MeV/c[superscript 2].
DepartmentMassachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
Aaltonen, T. et al. “Evidence for a Narrow Near-Threshold Structure in the J/ psi phi Mass Spectrum in B+-->J/ psi phi K+ Decays.” Physical Review Letters 102.24 (2009): 242002. (C)2010 The American Physical Society.
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