[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Wed., April 2, 2014
2:00 p.m. (coffee at 1:45 p.m.)
CEBAF Center, Room F113

Aron M. Bernstein
MIT

*Experimental Tests of QCD Symmetries with Pions: Entering A New Era *

We are entering a new era in which we can test confinement scale QCD in 
some well chosen reactions
such as pi-pi and pi-N scattering, pion properties, and electromagnetic 
pion production from the nucleon.
Based on the spontaneous breaking of chiral symmetry, chiral 
perturbation theory (ChPT) is believed to
approximate confinement scale QCD as demonstrated by increasingly 
accurate lattice calculations, particularly
in pi-pi scattering. Following a brief review of this field, emphasis 
will be given to recent, Increasingly accurate,
experiments in electromagnetic pion production experiments from the 
proton performed at Mainz and JLab;
these test ChPT calculations and their energy region of validity. The 
connection between electromagnetic pion
production, pi-N scattering, and quark mass effects will be presented.
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