Diquark Correlations from Nucleon Charge Radii

Details Diquark Correlations from Nucleon Charge Radii Diquark Correlations from Nucleon Charge Radii

2005-12-15

arxiv.org/abs/hep-ph/0512207v3

Phys.Lett. B635 (2006) 100-106

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, latex, 2 eps figures. v2: reference added. v3: discussion of results expanded

Scientific paper

10.1016/j.physletb.2006.02.050

We argue that precise measurements of charge and magnetic radii can meaningfully constrain diquark models of the nucleon. We construct properly symmetrized, nonrelativistic three-quark wave functions that interpolate between the limits of a pointlike diquark pair and no diquark correlation. We find that good fits to the data can be obtained for a wide range of diquark sizes, provided that the diquark wave functions are close to those that reduce to a purely scalar state in the pointlike limit. A modest improvement in the experimental uncertainties will render a fit to the charge radii a more telling diagnostic for the presence of spatially correlated quark pairs within the nucleon.

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