Higher orders and IR renormalon phenomenology in DVCS
arXiv:hep-ph/9801252 · doi:10.1016/S0550-3213(98)00308-3
Abstract
We present results for higher order perturbative corrections to Compton scattering in the generalized Bjorken kinematics. The approach we have used is based on the combination of two techniques: conformal operator product expansion on the one side, and resummation of the fermion vacuum insertions with consequent restoration of the full QCD beta-function via the naive nonabelianization assumption, on the other. These are terms which are lost in the former approach. Due to the presence of the infrared renormalon poles in the Borel transform of the resummed amplitude the latter suffers from ambiguities which reflect the asymptotic character of perturbation series. The residues of these IR renormalon poles give an estimate for the size of power corrections in deeply virtual Compton scattering.
29 pages, LaTeX, 2 figures, typos fixed
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- Broken conformal invariance and spectrum of anomalous dimensions in QCD
- Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
- Twist-three effects in two-photon processes
- Next-to-next-to-leading order prediction for the photon-to-pion transition form factor
- Next-to-leading order evolution of twist-two conformal operators: The abelian case
- Hard diffractive electroproduction of two pions
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- Scheme dependence of NLO corrections to exclusive processes
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- Soft Pion Emission in Hard Exclusive Pion Production
- Hard exclusive processes and higher-order QCD corrections