Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-25
Nucl.Phys. B649 (2003) 263-296
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages Latex
Scientific paper
10.1016/S0550-3213(02)01017-9
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 nonperturbative 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.
Ball Patricia
Braun Vladimir M.
Kivel Nikolai
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