Abstract
Our goal is the study of color effects on the J/ ψ and D mesons production, as well as the study of their elastic production. We use the color evaporation model (CEM), where a single factor takes into account the probability that the c c produced in a color octet state turns into a physical (colorless) quarkonium or continues as a color octet, producing open charm. The main result of this work, besides investigating the range of applicability of the CEM, is to show that this model can be used to describe the elastic processes of J/ ψ and open charm photoproduction without the use of a Pomeron.
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