The average transverse distance between partons as measured by nucleon form factors |
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Authors: | JF Gunion Davison E Soper |
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Institution: | Department of Physics, University of California, Davis, CA 95616, USA;Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403, USA |
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Abstract: | The values of at q2=0 for the neutron and the proton provide a measure of the average transverse separations squared, 〈〉, between a u or d quark and the rest of the partons in a nucleon. Using the measured values of the form factors (together with parton x-distributions), we find that 〈 for u quarks and 16.4 GeV?2 for d quarks in a proton. We speculate that the small difference between u and d quarks is caused by “quark pairing” and discuss other possible experimental signatures of quark pairing. |
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