Observation of a new charmonium state in double charmonium production in e+ e- annihilation at \sqrt{s} ~ 10.6 GeV

Abstract

We report the first observation of a new charmonium state at a mass of $(3.943\pm 0.006\pm 0.006)GeV/c^2$. This state, called X(3940), is observed in the process $e^{+}{e}^{-}\to J/\psi X(3940)$ in the spectrum of masses recoiling against a reconstructed $J/\psi$. We also observe the decay of the X(3940) into $D^{\ast }\bar{D}$ and measure the intrinsic width of this state to be less than $52MeV/c^2$ at the 90% C.L. These results are obtained from a $350f{b}^{-1}$ data sample collected with the Belle detector near the ${\rm Y}(4S)$ resonance, at the KEKB asymmetric energy $e^{+}{e}^{-}$ collider.

BELLE-CONF-0517

References in corpus (12)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Observation of the Narrow State $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ in $\bar{p}p$ Collisions at $\sqrt{s}=1.96 \TeV$
• Observation and Properties of the X(3872) Decaying to J/psi pi+ pi- in p-p(bar) Collisions at sqrt(s) = 1.96 TeV
• Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction
• Observation of a near-threshold omega-J/psi mass enhancement in exclusive B-->K omega J/psi decays
• Measurement of Double Charmonium Production in $e^{+}{e}^{-}$ Annihilations at $\sqrt{s}=10.6$ GeV
• New states above charm threshold
• Study of double charmonium production in e^+ e^- annihilation at \sqrt{s} ~ 10.6 GeV
• Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate

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