Evidence for a new resonance and search for the Y(4140) in $\gamma \gamma \to \varphi J/\psi$

Abstract

The process $γγ\to ϕ\jpsi$ is measured for $ϕ\jpsi$ masses between threshold and 5 GeV/$c^2$, using a data sample of 825 fb${}^{-1}$ collected with the Belle detector. A narrow peak of $8.8_{-3.2}^{+4.2}$ events, with a significance of 3.2 standard deviations including systematic uncertainty, is observed. The mass and natural width of the structure (named X(4350)) are measured to be $(4350.6_{-5.1}^{+4.6}(\mathrm{stat})\pm 0.7(\mathrm{syst}))MeV/c^2$ and $(13_{-9}^{+18}(\mathrm{stat})\pm 4(\mathrm{syst}))MeV$, respectively. The product of its two-photon decay width and branching fraction to $ϕ\jpsi$ is $(6.7_{-2.4}^{+3.2}(\mathrm{stat})\pm 1.1(\mathrm{syst}))eV$ for $J^P=0^{+}$, or $(1.5_{-0.6}^{+0.7}(\mathrm{stat})\pm 0.3(\mathrm{syst}))eV$ for $J^P=2^{+}$. No signal for the $Y(4140)\to ϕ\jpsi$ structure reported by the CDF Collaboration in $B\to K^+ ϕ\jpsi$ decays is observed, and limits of $Γ_{γγ}(Y(4140)) \BR(Y(4140)\toϕ\jpsi)<41 \hbox{eV}$ for $J^P=0^{+}$ or $<6.0eV$ for $J^P=2^{+}$ are determined at the 90% C.L. This disfavors the scenario in which the Y(4140) is a $D_s^{\ast +}{D}_s^{\ast -}$ molecule.

9 pages, 3 figures, publication in Phys. Rev. Lett. 104, 112004, 2010

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