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Titolo:
Twist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation
Autore:
Kivel, N; Mankiewicz, L;
Indirizzi:
Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany Univ Regensburg Regensburg Germany D-93040 , D-93040 Regensburg, Germany N Copernicus Astronom Ctr, PL-00716 Warsaw, Poland N Copernicus Astronom Ctr Warsaw Poland PL-00716 PL-00716 Warsaw, Poland Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland Andrzej Soltan Inst Nucl Studies Warsaw Poland PL-00689 9 Warsaw, Poland
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 4, volume: 21, anno: 2001,
pagine: 621 - 629
SICI:
1434-6044(200107)21:4<621:TPHAID>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
VIRTUAL COMPTON-SCATTERING; PARTON DISTRIBUTIONS; EVOLUTION-EQUATIONS; QUARK DISTRIBUTIONS; ART.; ELECTROPRODUCTION; FACTORIZATION; SPIN; QCD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Kivel, N Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany Univ Regensburg Regensburg Germany D-93040 Regensburg, Germany
Citazione:
N. Kivel e L. Mankiewicz, "Twist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation", EUR PHY J C, 21(4), 2001, pp. 621-629

Abstract

We computed the twist-4 part of the photon spin-flip amplitude in deeply virtual Compton scattering on a nucleon in the Wandzura-Wilczek approximation, We found a factorizable contribution, which arises from photon scattering on quarks with non-zero angular momentum along the collision axis. As thegenuine twist-2 amplitude arises at the NLO, for moderate virtualities of the hard photon, Q(2) less than or equal to 10 GeV2, a kinematical twist-4 correction can give a numerically important contribution to the photon helicity-flip amplitude.

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Documento generato il 28/03/20 alle ore 23:40:40