Virtual meson cloud of the nucleon and generalized parton distributions
摘要
We present the general formalism required to derive generalized parton distributions within a convolution model where the bare nucleon is dressed by its virtual meson cloud. In the one-meson approximation the Fock states of the physical nucleon are expanded in a series involving a bare nucleon and two-particle, meson-baryon, states. The baryon is assumed here to be either a nucleon or a described within the constituent quark model in terms of three valence quarks; correspondingly, the meson, assumed to be a pion, is described as a quark-antiquark pair. Explicit expressions for the unpolarized generalized parton distributions are obtained and evaluated in different kinematics.
引用
@article{arxiv.hep-ph/0601177,
title = {Virtual meson cloud of the nucleon and generalized parton distributions},
author = {B. Pasquini and S. Boffi},
journal= {arXiv preprint arXiv:hep-ph/0601177},
year = {2008}
}
备注
37 pages, 9 figures, minor corrections, and figure 3 replaced; version to appear in Phys. Rev. D