Speaker
Charlotte Van Hulse
(University of the Basque Country UPV/EHU)
Description
The study of the nucleon spin structure has been approached from two complementary perspectives. From the one hand, generalized parton distributions (GPDs) give information about the distribution of quarks and gluons inside the nucleon as a function of the fraction of their longitudinal momentum with respect to the longitudinal nucleon momentum and as a function of their transverse position inside the nucleon. Different distributions are of importance depending on the nucleon and parton polarization state.
In addition, some of these distributions provide access to the partons' angular momenta.
From the other hand, the transverse-momentum-dependent (TMD) parton distribution functions describe the distribution of quarks inside the nucleon as
a function of their longitudinal and transverse momenta. Also here, depending on the polarization state of the partons and nucleon, different distributions need to be considered. Both GPDs and TMD parton distribution functions reduce to the standard parton distribution functions when integrating over the respective transverse kinematic variables.
How to access the observables with electrons and positrons as well as the possible advantages of using both types of lepton beams will be presented and discussed.
Primary author
Charlotte Van Hulse
(University of the Basque Country UPV/EHU)
