Color evaporation description of inelastic photoproduction of J/psi at DESY HERA

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Data

2003-03-01

Autores

Eboli, OJP
Gregores, E. M.
Halzen, F.

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American Physical Soc

Resumo

The H1 Collaboration recently reported a new analysis of data on the inelastic photoproduction of J/psi mesons at DESY's HERA ep collider. We show that these new experimental results are well described by the color evaporation model for quarkonium production. Moreover, these new data require the introduction of resolved photon contributions in order to accommodate the results in the kinematic region where the fractional energy carried by the J/psi is small, demonstrating that colored perturbative c (c) over bar states contribute to the production of a color singlet.

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Physical Review D. College Pk: American Physical Soc, v. 67, n. 5, 5 p., 2003.