A toy model for generalised parton distributions

We give the results of a simple model for the diagonal and off-diagonal valence quark distributions of a pion. We show that structure can be implemented in a gauge-invariant manner. This explicit model questions the validity of the momentum sum rule, and gives an explicit counter-example to the Wand...

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Veröffentlicht in:	AIP conference proceedings 2005-01, Vol.775 (1), p.61-70
Hauptverfasser:	Cudell, J R, Bissey, F, Cugnon, J, Jaminon, M, Lansberg, J P, Stassart, P
Format:	Artikel
Sprache:	eng
Schlagworte:	DISTRIBUTION GAUGE INVARIANCE generalised parton distributions GLUON MODEL GLUONS GPD Physical, chemical, mathematical & earth Sciences Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Physique Physique, chimie, mathématiques & sciences de la terre pion PIONS QUARK MODEL QUARKS SUM RULES VALENCE
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Beschreibung
Zusammenfassung:	We give the results of a simple model for the diagonal and off-diagonal valence quark distributions of a pion. We show that structure can be implemented in a gauge-invariant manner. This explicit model questions the validity of the momentum sum rule, and gives an explicit counter-example to the Wandzura-Wilczek ansatz for twist-3 GPD's.
ISSN:	0094-243X 1551-7616 1551-7616
DOI:	10.1063/1.1961043