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Titolo:
Spin-dependent structure functions of real and virtual photons
Autore:
Gluck, M; Reya, E; Sieg, C;
Indirizzi:
Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany Univ Dortmund Dortmund Germany D-44221 t Phys, D-44221 Dortmund, Germany
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 2, volume: 20, anno: 2001,
pagine: 271 - 281
SICI:
1434-6044(200104)20:2<271:SSFORA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
LONGITUDINALLY POLARIZED PHOTON; PARTON DISTRIBUTIONS; LEADING-ORDER; CROSS-SECTIONS; SCATTERING; QCD; ASYMMETRIES; COLLISIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Gluck, M Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany Univ Dortmund Dortmund Germany D-44221 -44221 Dortmund, Germany
Citazione:
M. Gluck et al., "Spin-dependent structure functions of real and virtual photons", EUR PHY J C, 20(2), 2001, pp. 271-281

Abstract

The implications of the positivity constraint, \g(1)(gamma (P2))(x, Q(2))\less than or equal to F(1)gamma ((P2))(x-Q(2)), on the presently unknown spin-dependent structure function g(1)(gamma (P2))(x,Q(2)) of real and virtual photons are studied at scales Q2 much greater than P2 where longitudinally polarized photons dominate physically relevant cross sections. In particular it is shown how to implement the physical constraints of positivity and continuity at P-2 = 0 in NLO calculations which afford a nontrivial choice of suitable (DIS) factorization schemes related to g(1)(gamma) and F-1(gamma) and appropriate boundary conditions for the polarized parton distributions of real and virtual photons. The predictions of two extreme 'maximal' and 'minimal- saturation scerlarios are presented and compared with resultsobtained within the framework of a simple quark 'hox' calculation expectedto yield reasonable estimates in the not too small regions of x and P-2.

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Documento generato il 27/01/20 alle ore 07:26:25