Quark Model Calculations Of Symmetry Breaking in Parton Distributions

Details Quark Model Calculations Of Symmetry Breaking in Parton Distributions Quark Model Calculations Of Symmetry Breaking in Parton Distributions

1995-08-24

arxiv.org/abs/nucl-th/9508041v1

Physics

Nuclear Physics

Nuclear Theory

6 Pages, 3 postscript figures compressed using uufiles

Scientific paper

Using a quark model, we calculate symmetry breaking effects in the valence quark distributions of the nucleon. In particular, we examine the breaking of the quark model SU(4) symmetry by color magnetic effects, and find that color magnetism provides an explanation for deviation of the ratio $d_V(x)/u_V(x)$ from $1/2$. Additionally, we calculate the effect of charge symmetry breaking in the valence quark distributions of the proton and neutron and find, in contrast to other authors, that the effect is too small to be seen experimentally.

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