Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-20
Phys.Rev.D73:094001,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
37 pages, 9 figures, minor corrections, and figure 3 replaced; version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.73.094001
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 $\Delta$ 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.
Boffi Sigfrido
Pasquini Barbara
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