Evidence for a Narrow Near-Threshold Structure in the $J/ψφ$ Mass Spectrum in $B^+\to J/ψφK^+$ Decays

Details Evidence for a Narrow Near-Threshold Structure in the $J/ψφ$ Mass Spectrum in $B^+\to J/ψφK^+$ Decays Evidence for a Narrow Near-Threshold Structure in the $J/ψφ$ Mass Spectrum in $B^+\to J/ψφK^+$ Decays

2009-03-12

arxiv.org/abs/0903.2229v2

Phys.Rev.Lett.102:242002,2009

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 figures, published version in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.242002

Evidence is reported for a narrow structure near the $J/\psi\phi$ threshold in exclusive $B^+\to J/\psi\phi K^+$ decays produced in $\bar{p} p $ collisions at $\sqrt{s}=1.96 \TeV$. A signal of $14\pm5$ events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of $2.7 \ifb$, collected by the CDF II detector. The mass and natural width of the structure are measured to be $4143.0\pm2.9(\mathrm{stat})\pm1.2(\mathrm{syst}) \MeVcc$ and $11.7^{+8.3}_{-5.0}(\mathrm{stat})\pm3.7(\mathrm{syst}) \MeVcc$.

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