Instanton Contribution to the Proton and Neutron Electric Form Factors

Details Instanton Contribution to the Proton and Neutron Electric Form Factors Instanton Contribution to the Proton and Neutron Electric Form Factors

2002-05-27

arxiv.org/abs/hep-ph/0205307v2

Phys.Lett. B549 (2002) 93-100

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures, updated references, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(02)02886-1

We study the instanton contribution to the proton and neutron electric form factors. Using the single instanton approximation, we perform the calculations in a mixed time-momentum representation in order to obtain the form factors directly in momentum space. We find good agreement with the experimentally measured electric form factor of the proton. For the neutron, our result falls short of the experimental data. We argue that this discrepancy is due to the fact that we neglect the contribution of the sea quarks. We compare to lattice calculations and a relativistic version of the quark-diquark model.

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