[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, March 8, 2010
1:00 p.m.
CEBAF Center, Room L104
Coffee at 12:45 p.m.

*Baryon Chiral Perturbation Theory: One Loop and Beyond*

Matthias R. Schindler
George Washington University

For energies below 1 GeV, perturbative calculations in the strong 
coupling of QCD
are not meaningful. One of the theoretical tools to explore this energy 
region is the use
of an effective field theory, chiral perturbation theory (ChPT). After 
giving an
introduction to the underlying ideas of ChPT I will focus on the 
one-nucleon sector.
With the development of new renormalization schemes the evaluation of 
contributions
beyond one-loop order has become possible in a manifestly 
Lorentz-invariant formulation.
I will describe two different approaches to higher-order calculations: 
the inclusion of
additional degrees of freedom and the explicit calculation of two-loop 
diagrams.
Results for the nucleon form factors and the nucleon mass will be 
presented.
I will also discuss the connection to lattice QCD.
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