Exclusive decay of J/Ψ into a lepton pair combined with light hadrons Original Research Article

We study the exclusive decay of J/Ψ into a lepton pair combined with light hadrons in the kinematic region, specified by that the total energy of the light hadrons is much smaller than mc, the mass of the c-quark. In this region, the nonperturbative effect related to J/Ψ and that related to the light hadrons can be separated, the former is represented by a NRQCD matrix element, while the later is represented by a matrix element of a correlator of electric chromofields. The results are obtained in a axial gauge by assuming that contributions from two-gluon emission are dominant. But we can show that these results can be obtained without the assumption in arbitrary gauges. A discussion of the results are presented.