Small x: Two Pomerons!
High Energy Physics - Phenomenology
2009-10-31 v2 High Energy Physics - Experiment
Abstract
Regge theory provides a very simple and economical description of data for (i) the proton structure function with x<0.07 and all available Q^2 values, (ii) the charm structure function, and (iii) gamma p --> J/psi p. The data are all in agreement with the assumption that there is a second pomeron, with intercept about 1.4 . They suggest also that the contribution from the soft pomeron is higher twist. This means that there is an urgent need to make perturbative evolution compatible with Regge theory at small and not-so-small x, and to reassess the magnitude of higher-twist contributions at quite small x.
Keywords
Cite
@article{arxiv.hep-ph/9806344,
title = {Small x: Two Pomerons!},
author = {A Donnachie and P V Landshoff},
journal= {arXiv preprint arXiv:hep-ph/9806344},
year = {2009}
}
Comments
13 pages, plain tex, with 8 figures embedded using epsf. (Two typos corrected and a reference added.)