[Theory-seminars] Theory Seminar, Monday Mar 5, 1:00pm, Room L102 - Andreas Metz

[Alessandro Pilloni]

Theory Center Seminar
Monday, March 5
1:00pm
CEBAF Center, Room L102

Andreas Metz (Temple U.)
Twist-3 GPDs in Deeply-Virtual Compton Scattering
The sub-leading power of the scattering amplitude for deeply-virtual Compton scattering (DVCS) off the nucleon contains leading-twist and twist-3 generalized parton distributions (GPDs).  We point out that in DVCS, at twist-3 accuracy, one cannot address any individual quark twist-3 GPD.  Accessible are exclusively linear combinations involving both vector and axial-vector twist-3 GPDs.  This implies, in particular, that in DVCS there is no direct access to the (kinetic) orbital angular momentum of quarks through twist-3 GPDs.  Moreover, using the quark-target model, we find that twist-3 GPDs can be discontinuous.  The discontinuities however vanish in the DVCS amplitude, which further supports the hypothesis of factorization at twist-3 accuracy.

The bluejeans link for the remote connection is
https://bluejeans.com/335716039



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