The Electromagnetic Pion Form Factor and Instantons
arXiv:hep-ph/9408396 · doi:10.1016/0370-2693(94)01596-5
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.
12 pages, UMPP \#95--035, (2 figures available on request by e-mail or FAX)
References in corpus (2)
Cited by in corpus (21)
- Instantons in QCD
- Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor
- Direct instantons, topological charge screening and QCD glueball sum rules
- Scalar Gluonium and Instantons
- Systematic Study of the Single Instanton Approximation in QCD
- Pion form factor and QCD sum rules: case of axial current
- Electromagnetic form factors of the pion and kaon from the instanton vacuum
- Instanton Contribution to the Pion Electro-Magnetic Formfactor at Q^2 > 1 GeV^2
- Nonperturbative quark-antiquark interactions in mesonic form factors
- Light scalar mesons in QCD sum rules with inclusion of instantons
- Pion form factor and QCD sum rules: case of pseudoscalar current
- Proton Electro-Magnetic Form-Factors in the Instanton Liquid Model
- Instanton Contribution to the Electro-Magnetic Form Factors of the Nucleon
- Direct Instantons and Nucleon Magnetic Moments
- Pion electromagnetic formfactor in the instanton vacuum
- Isospin Breaking and Instantons in QCD Nucleon Sum Rules
- QCD Sum Rule Study for a Possible Charmed Pentaquark Θc(3250)
- Parameter free calculation of hadronic masses from instantons
- The Pauli Form Factor of Quark and Nontrivial Topological Structure of the QCD
- Instanton effects on the twist-three light-cone distribution amplitudes of pion and light scalar mesons above 1GeV
- Meson loop effects on the pion electromagnetic form factor