New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules

Details New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules

2001-12-29

arxiv.org/abs/hep-ph/0112357v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

Nonperturbative Wilson coefficients associated with the leading chiral-symmetry-breaking operators in the operator product expansion of the pseudoscalar QCD correlation function are derived. Implementation of the new, instanton-induced operators enables the corresponding spectral sum rule to reproduce the small pion mass scale, thereby reconciling it with Goldstone's theorem. The same operators suppress the contributions of pionic resonances. Several predictions and structural insights from the new sum rule are discussed.

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