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The Bridge Between Chiral Lagrangians and QCD Sum-Rules

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arxiv 1909.07243 v1 pith:IGRWG3EZ submitted 2019-09-16 hep-ph

classification hep-ph
keywords chiralfactorslagrangiansscalesum-rulesbridgecombinedmatrices
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Properties of the scale-factor matrices forming a bridge between the mesonic fields of chiral Lagrangians and quark-level structures of QCD sum-rules are reviewed. The scale-factor matrices combined with mixing angles provide a physical projection of a QCD correlation function matrix that disentangles the mesonic states. This methodology is illustrated for the isotriplet $a_0(980)$-$a_0(1450)$ system, and the scale factors are determined from the combined inputs of QCD sum-rules and chiral Lagrangians. The resulting scale factors are shown to be in good agreement with the vacuum expectation values in the chiral Lagrangian framework. The sensitivity of the scale factors on the gluon condensate QCD sum-rule parameter is explored.

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