Ball, Patricia and Braun, V. M. and Kivel, N. (2003) Photon distribution amplitudes in QCD. NUCLEAR PHYSICS B, 649 (1-2). pp. 263-296. ISSN 0550-3213
Full text not available from this repository.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. (C) 2002 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PERTURBATIVE QUANTUM CHROMODYNAMICS; TWIST DISTRIBUTION AMPLITUDES; DEEP-INELASTIC-SCATTERING; BACKGROUND FIELD METHOD; LARGE MOMENTUM-TRANSFER; TRANSITION FORM-FACTOR; EXCLUSIVE PROCESSES; EVOLUTION-EQUATIONS; WAVE-FUNCTIONS; ASYMPTOTIC-BEHAVIOR; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Aug 2021 11:47 |
| Last Modified: | 13 Aug 2021 11:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/39352 |
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