Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-11-21
PoS LC2008:043,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 3 figures. To appear in proceedings of LIGHT CONE 2008 Relativistic Nuclear and Particle Physics, Mulhouse, France, J
Scientific paper
We study large-distance contributions to the nucleon parton densities in the transverse coordinate (impact parameter) representation based on generalized parton distributions (GPDs). Chiral dynamics generates a distinct component of the partonic structure, located at momentum fractions x ~< M_pi/M_N and transverse distances b ~ 1/M_pi. We analyze the phenomenological "pion cloud" model of the flavor asymmetry dbar(x) - ubar(x) and quantify what fraction of the calculated asymmetry results from the universal large-distance region. Our findings indicate that a two-component picture of the nucleon's partonic structure, with a "core" antiquark distribution at b < b_core ~= 0.55 fm which vanishes at x -> 0 and the universal large-distance pion cloud, could naturally account for the x-dependence of the measured asymmetry.
Strikman Mark
Weiss Carsten
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