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- W2068251680 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." @default.
- W2068251680 created "2016-06-24" @default.
- W2068251680 creator A5012029218 @default.
- W2068251680 creator A5034889541 @default.
- W2068251680 date "2005-01-14" @default.
- W2068251680 modified "2023-09-25" @default.
- W2068251680 title "Helicity-dependent generalized parton distributions and composite constituent quarks" @default.
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- W2068251680 doi "https://doi.org/10.1103/physrevd.71.014014" @default.
- W2068251680 hasPublicationYear "2005" @default.