Abstract
Based on Pomeron exchange model, elastic production of vectormeson in electro-proton interaction is investigated with bothlinear and non-linear Pomeron trajectory. A numerical calculationfor J/ψ production is performed. The effect of the energyscale s0 and photon virtuality Q2 on differential crosssection are also predicted. A good agreement with experimentaldata is obtained. Our conclusions are that the Pomeron exchangemodel is a successful description of J/ψ electro-production,the dependence of the differential cross sections on Q2 isnegligible, the linear trajectory is a good approximation tonon-linearity of the Pomeron trajectory, and the value of theenergy scale parameter s0 is dependent on the momentumtransfer, namely its effect is moderate at low momentum transferbut it causes no difference at high momentum transfer ∣t∣⩾1.25 GeV2.
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