## Issues in the GPD-formulation of DVCS

### Bernard Bakker (Vrije U., Amsterdam)

3:30 PM, Tuesday, Sep. 25, NC State

The amplitudes of Deeply Virtual Compton Scattering (DVCS) can be
parametrized in terms of Generalized Parton Distributions (GPDs).
The number of GPDs involved is determined by the target spin alone.
However, which of the GPDs is accessible by experiments, depends on
the kinematics. In this work the amplitude for DVCS on a spin-0 target
is analyzed. The number of GPDs compatible with electro-magnetic gauge
invariance is determined. Moreover, for different kinematics the dominant
GPDs in an expansion of the amplitude in inverse powers of the hard
scale Q is found.