Speaker: Simonetta Liuti (University of Virginia)

Title: What Deeply Virtual $\pi^0$  Electroproduction Really Measures?

Abstract:
Exclusive $\pi^0$ electroproduction from the proton is discussed.
This process isolates C-parity odd and chiral odd combinations of 
t-channel exchange quantum numbers, and its helicity structure 
relates to the quark helicity flip, or chiral odd generalized parton 
distributions. An important consequence is that the collinear, 
leading twist $\gamma_\mu \gamma_5$ type contribution to the $\pi^0$
wave function does not have the correct chirality for $\pi^0$ 
electroproduction. A leading twist production mechanism can be 
considered only by introducing Orbital Angular Momentum (OAM).
We present a new model that takes into account these important 
considerations.