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Exotic vector charmonium and its leptonic decay width · Around

2016

Exotic vector charmonium and its leptonic decay width

Chen, Ying, Chiu, Wei-Feng, Gong, Ming et al.

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We propose a novel type of interpolating field operators, which manifests the hybrid-like configuration that the charm quark-antiquark pair recoils against gluonic degrees of freedom.

A heavy vector charmonium-like state with a mass of $4.33(2)\,{\rm GeV}$ is disentangled from the conventional charmonium states in the quenched approximation.
This state has affinity for the hybrid-like operators but couples less to the relevant quark bilinear operator.
We also try to extract its leptonic decay constant and give a tentative upper limit that it is less than one tenth of that of $J/\psi$, which corresponds to a leptonic decay width about dozens of eV.

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