Photon distribution amplitudes in QCD

By P. Ball, V. Braun, N. Kivel. 2002

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Abstract We develop a consistent technique for the calculation of real photon emission in hard exclusive processes, which is based on the background field formalism and allows a convenient separation of hard electromagnetic and soft hadronic components of the photon. The latter ones are related to matrix-elements of light-cone operators in the electromagnetic background field and can be parametrized in terms of photon distribution amplitudes. We construct a complete set of photon distribution amplitudes up to and including twist-4, for both chirality-conserving and chirality-violating operators. The distribution amplitudes involve several non-perturbative parameters and, most importantly, the magnetic susceptibility of the quark condensate. We review and update previous estimates of the susceptibility and also give new estimates of parameters describing higher-twist amplitudes from QCD sum rules.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3f43c56aba4a3c597bf9cd4f58ab47c0c0e5ba4a