Abstract
Nucleon spin structure, transversity and the tensor charge are of central importance to understanding the role of QCD in hadronic physics. A new approach to measuring orbital angular momenta of quarks in the proton via twist 3 GPDs is shown. The “flexible parametrization” of chiral even GPDs is reviewed and its transformation into the chiral odd sector is discussed. The resulting parametrization is applied to recent data on π 0 and η electroproduction.
Highlights
Transversity and the tensor charge are of central importance to understanding the role of QCD in hadronic physics
Understanding the nature of angular momenta among the quark and gluon fields that compose the nucleon has been of great interest for decades
There has been considerable attention focused on the interpretation of Orbital Angular Momentum (OAM) within the constraints of gauge invariance and Lorentz covariance
Summary
Understanding the nature of angular momenta among the quark and gluon fields that compose the nucleon has been of great interest for decades. There has been considerable attention focused on the interpretation of Orbital Angular Momentum (OAM) within the constraints of gauge invariance and Lorentz covariance. We will briefly present a method for measuring the twist 3 GPD G2 that is associated with “dynamical OAM" [1]. We will summarize the “flexible parametrization" for chiral even, leading twist GPDs that have been applied extensively to DVCS [2] and EM form factor data [3]. Using the helicity representation for GPDs, the chiral odd sector normalizations are nearly determined [4]. The resulting observables are compared to experimental data
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