Evidence for a Narrow Near-Threshold Structure in the J/ψϕ Mass Spectrum in B+→J/ψϕK+ Decays
Abstract
Evidence is reported for a narrow structure near the J/ψϕ threshold in exclusive B+→J/ψϕK+ decays produced in pmacr p 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 luminosity of 2.7fb-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.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2009
- DOI:
- 10.1103/PhysRevLett.102.242002
- arXiv:
- arXiv:0903.2229
- Bibcode:
- 2009PhRvL.102x2002A
- Keywords:
-
- 14.40.Gx;
- 12.39.Mk;
- 13.25.Gv;
- Mesons with S=C=B=0 mass>2.5 GeV;
- Glueball and nonstandard multi-quark/gluon states;
- Decays of J/psi Upsilon and other quarkonia;
- High Energy Physics - Experiment
- E-Print:
- 7 pages, 2 figures, published version in Phys. Rev. Lett