1. Probing Spin Dependent Quark and Gluon Distributions Through Azimuthal and Polarization Asymmetries
- Author
-
Gary R. Goldstein and Simonetta Liuti
- Subjects
Quark ,Quantum chromodynamics ,Physics ,Particle physics ,010308 nuclear & particles physics ,QC1-999 ,High Energy Physics::Phenomenology ,Hadron ,Parton ,Observable ,Polarization (waves) ,01 natural sciences ,Helicity ,Gluon ,Nuclear physics ,0103 physical sciences ,High Energy Physics::Experiment ,Nuclear Experiment ,010306 general physics - Abstract
Spin and transverse momentum dependent parton distributions - Generalized Parton Distributions, Transverse Momentum Distributions and related distributions - are at the interface between the QCD structure of the hadrons and observable quantities. The distributions are contained as linear superpositions within helicity amplitudes that factorize into universal forms at leading or next to leading order. These amplitudes are probed in high energy leptoproduction processes through angular dependent cross sections and polarization asymmetries. The phenomenological extraction of the amplitudes and the distributions is a challenging task. We will present some models for the distributions in leptoproduction processes, as well as the observables that connect with the quark-nucleon helicity amplitudes for different Deeply Virtual production possibilities.
- Published
- 2016