[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, Nov 9, 2015
1:00 p.m. (coffee  at 12:45 p.m.)
CEBAF Center, Room L102

Yao Ji
Arizona State University

*Compton Scattering: Deep Virtual to Quasi-Real *

We address the question of interpolation of the virtual Compton 
scattering process off a
polarized nucleon target between the deeply virtual regime for the 
initial state photon and
its near on-shell kinematics making use of the photon helicity-dependent 
Compton Form
Factors (CFFs) as a main ingredient of the formalism. We suggest a 
simple parametrization
of the Compton hadronic tensor in terms of CFFs which are free from 
kinematical singularities.
We also provide a relation of our basis spanned by a minimal number of 
Dirac bilinears to the
one introduced by Tarrach for the parametrization of the virtual Compton 
tensor and utilize
the former to establish a set of equalities among our CFFs and 
Generalized Polarizabilities.
As a complementary result, we express Compton scattering in the Born 
approximation in
terms of CFFs as well.
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