Type: Article
Publication Date: 2004-09-28
Citations: 48
DOI: https://doi.org/10.1103/physrevd.70.054023
Recent studies of exclusive electroproduction of vector mesons at JLab make it possible for the first time to play with two independent hard scales: the virtuality ${Q}^{2}$ of the photon, which sets the observation scale, and the momentum transfer $t$ to the hadronic system, which sets the interaction scale. They reinforce the description of hard-scattering processes in terms of few effective degrees of freedom relevant to the JLab-Hermes energy range.