26-30 April 2009
Palacio de Congresos de Madrid
Europe/Zurich timezone

Theoretical status of J/psi production at HERA

27 Apr 2009, 11:15
Room "SALA 2-B" (Palacio de Congresos de Madrid)

Room "SALA 2-B"

Palacio de Congresos de Madrid

Paseo de la Castellana, 99 28046 Madrid España


Pierre Artoisenet (Univerite catholique de Louvain)


In this talk, I review the photo-production of J/psi states at HERA. In the framework of NRQCD, I present the various components expected to contribute to the J/psi yield at HERA, and their importance in different regions of the phase space. I compare the predicted differential cross sections with the data collected by the ZEUS and H1 collaborations. I then move on the polarization observables and present the brand-new color-singlet prediction at NLO accuracy in alpha_s, in view of the recent measurement performed by the ZEUS collaboration. Based on these results, I argue that the sole color-singlet yield fails to explain the J/psi distributions measured at HERA.

Primary author

Pierre Artoisenet (Univerite catholique de Louvain)

Presentation Materials