The Electromagnetic Pion Form Factor and Instantons
High Energy Physics - Phenomenology
2009-10-28 v1
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/9408396,
title = {The Electromagnetic Pion Form Factor and Instantons},
author = {Hilmar Forkel and Marina Nielsen},
journal= {arXiv preprint arXiv:hep-ph/9408396},
year = {2009}
}
Comments
12 pages, UMPP \#95--035, (2 figures available on request by e-mail or FAX)