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Titolo:
Nonforward parton densities and soft mechanism for form factors and wide-angle Compton scattering in QCD - art. no. 114008
Autore:
Radyushkin, AV;
Indirizzi:
JINR, Theoret Phys Lab, Dubna, Russia JINR Dubna RussiaJINR, Theoret Phys Lab, Dubna, Russia Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA Old Dominion Univ Norfolk VA USA 23529 , Dept Phys, Norfolk, VA 23529 USA Jefferson Lab, Newport News, VA 23606 USA Jefferson Lab Newport News VA USA 23606 n Lab, Newport News, VA 23606 USA
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 11, volume: 5811, anno: 1998,
pagine: 4008 -
SICI:
0556-2821(199812)5811:11<4008:NPDASM>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
PION WAVE-FUNCTION; QUARK DISTRIBUTION AMPLITUDE; SUM-RULES; EXCLUSIVE PROCESSES; QUANTUM CHROMODYNAMICS; EVOLUTION-EQUATIONS; TRANSVERSE-MOMENTUM; ASYMPTOTIC-BEHAVIOR; ELECTROPRODUCTION; FACTORIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Radyushkin, AV Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA Old Dominion Univ Norfolk VA USA 23529 rfolk, VA 23529 USA
Citazione:
A.V. Radyushkin, "Nonforward parton densities and soft mechanism for form factors and wide-angle Compton scattering in QCD - art. no. 114008", PHYS REV D, 5811(11), 1998, pp. 4008

Abstract

We argue that, at a moderately large momentum transfer - t less than or similar to 10 GeV2, hadronic form factors and wide-angle Compton scattering amplitudes are dominated by a mechanism corresponding to the overlap of softwave functions. We show that the soft contribution in both cases can be described in terms of the same universal nonforward parton densities (ND's) F(x;t), which are the simplest hybrids of the usual parton densities and hadronic form factors. We propose a simple model for ND's possessing required reduction properties. Our model easily reproduces the observed magnitude and the dipole a dependence of the proton form factor F-1(p)(t) in the region1 GeV2 <- t< 10 GeV2. Our results for the wide-angle Compton scattering cross section follow the angular dependence of existing data and are rather close to the data in magnitude. [S0556-2821(98)01321-6].

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Documento generato il 06/04/20 alle ore 04:16:01