Speaker: William Gibbs (Department of Physics, New Mexico State University)

The Contribution of the Light Quark Condensate to the Pi-N Sigma Term

There has been a discrepancy between values of the pion-nucleon sigma term extracted by two different methods for many years. Analysis of recent high precision pion-nucleon data has widened the gap between the two determinations. Developments in the data analysis will be reviewed and a very brief history of the sigma term will be given. I will present arguments that the two extractions correspond to different quantities and that the difference between them can be understood and calculated in terms of the light quark condensate.