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Theory Center Seminar<br>
Monday, Nov 9, 2015<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
Yao Ji<br>
Arizona State University<br>
<br>
<b>Compton Scattering: Deep Virtual to Quasi-Real </b><br>
<br>
We address the question of interpolation of the virtual Compton
scattering process off a <br>
polarized nucleon target between the deeply virtual regime for the
initial state photon and<br>
its near on-shell kinematics making use of the photon
helicity-dependent Compton Form <br>
Factors (CFFs) as a main ingredient of the formalism. We suggest a
simple parametrization <br>
of the Compton hadronic tensor in terms of CFFs which are free from
kinematical singularities. <br>
We also provide a relation of our basis spanned by a minimal number
of Dirac bilinears to the <br>
one introduced by Tarrach for the parametrization of the virtual
Compton tensor and utilize <br>
the former to establish a set of equalities among our CFFs and
Generalized Polarizabilities. <br>
As a complementary result, we express Compton scattering in the Born
approximation in <br>
terms of CFFs as well.
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