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We show results from calculations in full lattice QCD of the mass, leptonicwidth and radiative decay rate to eta_c of the J/psi meson. These provide few %tests of QCD. Another (1.5%) test comes from comparison of time-moments of thevector charmonium correlator with results derived from the experimental valuesof R(e+e- to hadrons) in the charm region.

Precision tests of the J/psi from full lattice QCD: mass, leptonic width and radiative decay rate to eta_c