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Theory Center Seminar<br>
Monday, March 8, 2010<br>
1:00 p.m.<br>
CEBAF Center, Room L104<br>
Coffee at 12:45 p.m.<br>
<br>
<b>Baryon Chiral Perturbation Theory: One Loop and Beyond</b><br>
<br>
Matthias R. Schindler<br>
George Washington University<br>
<br>
For energies below 1 GeV, perturbative calculations in the strong
coupling
of QCD <br>
are not meaningful. One of the theoretical tools to explore this
energy
region is the use<br>
of an effective field theory, chiral perturbation
theory (ChPT).
After giving an<br>
introduction to the underlying ideas of ChPT I will
focus on the
one-nucleon sector. <br>
With the development of new renormalization schemes
the
evaluation of contributions<br>
beyond one-loop order has become possible
in a
manifestly Lorentz-invariant formulation. <br>
I will describe two different
approaches
to higher-order calculations: the inclusion of <br>
additional degrees of
freedom and the
explicit calculation of two-loop diagrams. <br>
Results for the nucleon form
factors and
the nucleon mass will be presented. <br>
I will also discuss the connection
to lattice
QCD.
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