Form factor of the process γ^*γ^* -->π^o for small Virtuality of One of the Photons and QCD Sum Rules

Details Form factor of the process γ^*γ^* -->π^o for small Virtuality of One of the Photons and QCD Sum Rules Form factor of the process γ^*γ^* -->π^o for small Virtuality of One of the Photons and QCD Sum Rules

1995-07-28

arxiv.org/abs/hep-ph/9507447v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, uses epsf.sty, 1 eps figure

Scientific paper

We extend the QCD sum rule analysis of the \gamma^*\gamma^* -->\pi^o form factor into the region where one of the photons has small virtuality: q^2 << Q^2 > 1 GeV^2. In this kinematics, one should perform an additional factorization of short- and long-distance contributions. The extra long-distance sensitivity of the three-point amplitude is described by two-point correlators (bilocals), and the low-momentum dependence of the correlators involving composite operators of two lowest twists is extracted from auxiliary QCD sum rules. Our estimates for the form factor at q^2=0, Q^2 > 1 1 GeV^2 are in good agreement with existing experimental data.

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