Evidence of Instanton Effects in Hadrons from the Study of Low Eigenfunctions of the Dirac Operator

Preprint

27 September 1997

preprint
Published by arXiv in arXiv

Abstract

To elucidate the role in hadron structure of quark zero modes associated with instantons, the lowest eigenfunctions of the Dirac operator have been calculated in quenched QCD, full QCD, and full QCD with cooling. Eigenmodes associated with a single instanton and an instanton--anti-instanton pair were studied to understand the role of lattice artifacts for Wilson Fermions. By truncating the spectral representation of the quark propagator, we show that the rho and pion contributions to the vector and pseudoscalar correlation functions are dominated by the zero-mode contributions.

Keywords

LOW EIGENFUNCTIONS
INSTANTON EFFECTS
DIRAC OPERATOR
ZERO MODES
HADRON
QUARK
QCD

All Related Versions

Version 1, 1997-09-27, ArXiv
Version 2, 1997-09-30, ArXiv
Published version: Nuclear Physics B - Proceedings Supplements, 63 (1-3), 504.

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