Observation of the $Y(4140)$ structure in the $J/\psi \varphi$ Mass Spectrum in $B^{\pm }\to J/\psi \varphi K$ cays

Abstract

The observation of the $Y(4140)$ structure in $B^{\pm }\to J/\psi \varphi K^{\pm }$ 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 $J/\psi \varphi$ mass spectrum is performed assuming the presence of a Breit-Wigner resonance. The fit yields a signal of $19_{-5}^{+6}$ 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.

7 pages, 2 figures, submited to Phys. Rev. Lett

References in corpus (1)

• Evidence for a Narrow Near-Threshold Structure in the $J/\psi \varphi$ Mass Spectrum in $B^{+}\to J/\psi \varphi K^{+}$ Decays

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