The Electromagnetic Pion Form Factor and Instantons

Details The Electromagnetic Pion Form Factor and Instantons The Electromagnetic Pion Form Factor and Instantons

1994-08-30

arxiv.org/abs/hep-ph/9408396v1

Phys.Lett. B345 (1995) 55-60

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, UMPP \#95--035, (2 figures available on request by e-mail or FAX)

Scientific paper

10.1016/0370-2693(94)01596-5

We calculate the electromagnetic pion form factor at intermediate space-like momentum transfer from the QCD sum rule for the correlation function of two {\it pseudoscalar } interpolating fields and the electromagnetic current. This correlator receives essential contributions from direct ({\it i.e.} small-scale) instantons, which we evaluate under the assumption of an instanton size distribution consistent with instanton liquid and lattice simulations. The resulting form factor is in good agreement both with the sum rule based on the axial-current correlator and with experiment.

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