QCD SUM-RULE AND PERTURBATIVE QCD APPROACHES TO PION COMPTON-SCATTERING

Authors
CORIANO C LI HN
Citation
C. Coriano et Hn. Li, QCD SUM-RULE AND PERTURBATIVE QCD APPROACHES TO PION COMPTON-SCATTERING, Physics letters. Section B, 309(3-4), 1993, pp. 409-415
Citations number
28
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
309
Issue
3-4
Year of publication
1993
Pages
409 - 415
Database
ISI
SICI code
0370-2693(1993)309:3-4<409:QSAPQA>2.0.ZU;2-G
Abstract
We compare two approaches to the description of pion Compton scatterin g at moderate momentum transfer, one being based on local duality QCD sum rules for the invariant amplitudes of the process, which have been derived recently, and the other on the modified factorization formula with Sudakov effects included. We find that perturbative QCD predicti ons are dominant over those from QCD sum rules only for the scattering angle greater than 40-degrees.