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HK: Physik der Hadronen und Kerne

HK 9: Poster Session: Theory

HK 9.19: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules — •Hilmar Forkel — Institut für Theoretische Physik, Uni Heidelberg, Philosophenweg 19, 69120 Heidelberg

We introduce instanton-generated Wilson coefficients associated with the leading chiral-symmetry-breaking operators in the operator product expansion of the pseudoscalar correlator. The new contributions are fully nonperturbative (both at soft and hard momenta) and supply previously missing information about spontaneous chiral symmetry breaking which reconciles the associated pseudoscalar sum rule with Goldstone’s theorem. As a consequence, this sum rule becomes the first in its channel which is able to reproduce the light mass scale of the pion, thereby resolving a longstanding puzzle. Several predictions and structural insights from the new sum rule are discussed.