Cross sections for hard exclusive electroproduction of pi+ mesons on a hydrogen target
High Energy Physics - Experiment
2008-11-26 v2
Abstract
The exclusive electroproduction of pi+ mesons was studied with the Hermes spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off an internal hydrogen gas target. The virtual-photon cross sections were measured as a function of the Mandelstam variable t and the squared four momentum -Q^2 of the exchanged virtual photon. A model calculation based on Generalized Parton Distributions is in fair agreement with the data at low values of |t| if power corrections are included. A model calculation based on the Regge formalism gives a good description of the magnitude and the t and Q^2 dependences of the cross section.
Keywords
Cite
@article{arxiv.0707.0222,
title = {Cross sections for hard exclusive electroproduction of pi+ mesons on a hydrogen target},
author = {HERMES Collaboration and A. Airapetian},
journal= {arXiv preprint arXiv:0707.0222},
year = {2008}
}
Comments
7 pages, 5 figures, revised text