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Helicity-dependent generalized parton distributions and composite constituent quarks

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Helicity-dependent generalized parton distributions and composite constituent quarks

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dc.contributor.author Scopetta, Sergio
dc.contributor.author Vento Torres, Vicente
dc.date.accessioned 2015-05-12T11:39:10Z
dc.date.available 2015-05-12T11:39:10Z
dc.date.issued 2005
dc.identifier.citation Scopetta, Sergio Vento Torres, Vicente 2005 Helicity-dependent generalized parton distributions and composite constituent quarks Physical Review D 71 1 014014
dc.identifier.uri http://hdl.handle.net/10550/43735
dc.description.abstract An approach, recently proposed to calculate the nucleon generalized parton distributions (GPDs) in a constituent quark model (CQM) scenario, in which the constituent quarks are taken as complex systems, is used to obtain helicity-dependent GPDs. They are obtained from the wave functions of the non relativistic CQM of Isgur and Karl, convoluted with the helicity-dependent GPDs of the constituent quarks themselves. The latter are modelled by using the polarized structure functions of the constituent quark, the double distribution representation of GPDs, and a phenomenological constituent quark form factor. The present approach permits to access a kinematical range corresponding to both the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and the Efremov-Radyushkin-Brodsky-Lepage regions, for small values of the momentum transfer and of the skewedness parameter. In this kinematical region, the present calculation represents a prerequisite for the evaluation of cross sections relevant to deeply virtual Compton scattering. In particular, we have calculated the leading twist helicity-dependent GPD \tilde H and, from our expressions, its general relations with the non relativistic definition of the axial form factor and with the leading twist polarized quark density are consistently recovered.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2005, vol. 71, num. 1, p. 014014
dc.subject Física
dc.title Helicity-dependent generalized parton distributions and composite constituent quarks
dc.type journal article es_ES
dc.date.updated 2015-05-12T11:39:11Z
dc.identifier.doi 10.1103/PhysRevD.71.014014
dc.identifier.idgrec 028160
dc.rights.accessRights open access es_ES

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