Color evaporation and elastic [ípsilon] photoproduction at DESY HERA
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2002Tipo
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Abstract
The diffractive photoproduction of vector mesons is usually described by considering the two-gluon (Pomeron) exchange, the nondiagonal parton distributions, and the contribution of the real part to the cross section. In this Brief Report we analyze the diffractive photoproduction of the Y at DESY HERA using an alternative model, the color evaporation model (CEM), where the cross section is simply determined by the boson-gluon cross section and an assumption for the production of the colorless s ...
The diffractive photoproduction of vector mesons is usually described by considering the two-gluon (Pomeron) exchange, the nondiagonal parton distributions, and the contribution of the real part to the cross section. In this Brief Report we analyze the diffractive photoproduction of the Y at DESY HERA using an alternative model, the color evaporation model (CEM), where the cross section is simply determined by the boson-gluon cross section and an assumption for the production of the colorless state. We verify that, as in the J/Ψ case, the HERA data for this process can be well described by the CEM. Moreover, we propose the analysis of the ratio R=σY /σJ/Ψ to discriminate between the different approaches. ...
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Physical review. D, Particles and fields. Vol. 65, no. 3 (Feb. 2002), 037503 4p.
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Artigos de Periódicos (39401)Ciências Exatas e da Terra (5976)
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