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Theory Center Seminar<br>
Monday, Feb 22, 2016<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
Herve Moutarde<br>
CEA Saclay<br>
<br>
<b>Lorentz Covariance and Positivity Constraints in the Modeling of
Generalized Parton Distributions</b><br>
<br>
The concept of Generalized Parton Distributions promises an
understanding of the generation of the charge, spin, <br>
and energy-momentum structure of hadrons by their fundamental
constituents, quarks and gluons. Forthcoming <br>
measurements with unprecedented accuracy at Jefferson Lab will
presumably challenge our quantitative description<br>
of the three-dimensional structure of hadrons. To fully exploit
these future experimental data, new tools and models <br>
are currently being developed. We will explain the difficulties of
Generalized Parton Distribution modeling, and present<br>
some recent progress. In particular we will discuss various
equivalent parameterizations and sketch how to combine<br>
them to obtain models satisfying a priori all required theoretical
constraints. We will explain why these developments <br>
naturally fit in a versatile software platform, named PARTONS,
dedicated to the phenomenology of GPDs.
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