[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Mon., Feb. 6, 2012
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L104


*Time-Like Compton Scattering *

Jakub Wagner
Institute for Nuclear Research
Warsaw, Poland

Generalized Parton Distributions (GPDs) offer a new way to access the 
quark and gluon
nucleon structure. We advocate the need to supplement the experimental 
study of deeply
virtual Compton scattering (DVCS), i..e. the exclusive leptoproduction 
of a real photon,
by its crossed version, time-like Compton scattering (TCS), i.e. the 
exclusive photoproduction
of a lepton pair with large invariant mass. Both amplitudes factorize 
with the same GPDs as
their soft parts and coefficient functions which differ significantly at 
next to leading order in
alpha_s. We review recent progress in this domain, emphasizing the need 
to include NLO
corrections to any phenomenological program to extract GPDs from 
experimental data.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/jlab-seminars/attachments/20120202/f6af5e7c/attachment.html