Observation of the Y (4140) structure in the J/ψΦ mass spectrum in B±→ J/ψΦK ± decays
Here, the observation of the $Y(4140)$ structure in $B^\pm\rightarrow J/\psi\,\phi K^\pm$ decays produced in $\bar{p} p $ collisions at $\sqrt{s}=1.96~TeV$ is reported with a statistical significance greater than 5 standard deviations. A fit to the $J/\psi\,\phi$ mass spectrum is performed assuming the presence of a Breit-Wigner resonance. The fit yields a signal of $19^{+6}_{-5}$ resonance events, and resonance mass and width of $4143.4^{+2.9}_{-3.0}(\mathrm{stat})\pm0.6(\mathrm{syst}) ~MeVcc$ and $15.3^{+10.4}_{-6.1}(\mathrm{stat})\pm2.5(\mathrm{syst})~MeVcc$ respectively. The parameters of this resonance-like structure are consistent with values reported from an earlier CDF analysis.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗