[clas_members] Fwd: [Jlab-seminars] Theory Center Seminar

[Pawel Nadel-Turonski]

Hello Everyone,

If you are currently at JLab you may be interested in the talk on 
timelike DVCS this Monday (see details below). This will also be the 
topic of the first proposal to be submitted as part of the planned 
CLAS12 e+e- program.

Best Regards,

     Pawel

-------- Original Message --------
Subject: 	[Jlab-seminars] Theory Center Seminar
Date: 	Thu, 02 Feb 2012 09:03:41 -0500
From: 	Mary Fox <mfox at jlab.org>
To: 	jlab-seminars at jlab.org



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.
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