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

TL;DR

This paper reports the first observation of a new charmonium state, X(3940), produced in e+ e- collisions, with measurements of its mass, decay modes, and width, using data from the Belle detector.

Contribution

The paper presents the first detection and characterization of the X(3940) charmonium state in e+ e- annihilation at 10.6 GeV.

Findings

Observation of X(3940) at 3.943 GeV/c^2

Decay of X(3940) into D* D̄

Width of X(3940) less than 52 MeV/c^2

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 $D^* \bar{D}$ 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.