Color-evaporation-model prediction for σ(e ⁺e ^- → J/ψ + X) at B Factories

The cross section for inclusive J/ψ production in e ⁺e ^- annihilation at B factories is calculated using the color-evaporation model (CEM). The prediction can be used to estimate the fraction of inclusive J/ψ + cc̄ processes in the inclusive J/ψ production rate, which is measured by the Belle Collaboration. The color-evaporation-model prediction for the inclusive J/ψ production crosssection is shown to be about a factor of about 7-8 smaller than the values measured at the B factories. The underestimate of the CEM prediction for the inclusive J/ψ cross-section is observed to become more severe as the available phase space decreases.