“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 8943 |
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| Abstract: | |||||||
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Sea quark densities in the nucleon, based on the constituent quark model are analyzed.
To model the asymmetry of these densities the meson cloud or alternatively chiral quark
model (�QM) is used. Valence quark densities of the meson which are required to extract
the sea quark densities in the constituent quarks are obtained using the phenomenological
valon model. In addition to the standard pertutrbative QCD approach which uses the
MS scheme with a physical choice of renormalization scale , the calculations are also performed
using the Complete RG-Improvement (CORGI) approach. To avoid a physically
unacceptable Q2 behavior of the sea densities inside the constituent quarks, we assume
that the free parameter which exists in the vertex function of the boson-quark splitting
function, is Q2-dependent. Using the unsymmetrized sea densities of the nucleon which
result from convoluting the constituent density in a nucleon with the quark density in
the constituent quark, the Gottfried Sum Rule (GSR) is calculated using the standard
perturbative and CORGI approaches. The CORGI result is closer to the reported experimental
value for the GSR. The extracted sea and valence quark density in a nucleon,
using �QM and also the CORGI approach, have been compared with available experimental
data and what was obtained, based on �QM in the standard approach. This
comparison confirms the anticipated better agreement of the CORGI approach with the
data.
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