Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-07-04
Phys.Rev.Lett.98:082001,2007
Physics
High Energy Physics
High Energy Physics - Experiment
BELLE-CONF-0517
Scientific paper
10.1103/PhysRevLett.98.082001
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 $D^* \bar{D}$ and measure the intrinsic width of this state to be less than $52 MeV/c^2$ at the 90% C.L. These results are obtained from a $350 fb^{-1}$ data sample collected with the Belle detector near the $\Upsilon(4S)$ resonance, at the KEKB asymmetric energy $e^+ e^-$ collider.
Abe Kanshi
The Belle Collaboration
No associations
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