[Triumf-seminars] TRIUMF Seminar today at 14:00

postmaster at admin.triumf.ca postmaster at admin.triumf.ca
Thu Sep 17 10:57:33 PDT 2009


Date/Time: Thu 2009-09-17 at 14:00

Location:  Auditorium          

Speaker:   A.M. Bernstein (Massachusetts Institute of Technology)

Title:     Electromagnetic Pion Production and Decay Experiments: Testing  QCD Symmetries

Abstract: Pion production experiments test predictions  based on  spontaneous chiral symmetry breaking in QCD. As a consequence the pion  is produced and interacts weakly at low energies. The relationship between electromagnetic pion production and pi-N scattering, and a brief summary of past experiments and future possibilities will be presented, including the effects of strong isospin breaking (proportional to the mass difference of the up and down quarks). The decay rate of the pi0 into two gammas is due to the axial anomaly of QCD plus small isospin breaking chiral corrections. The results of a recent measurement to test this prediction will be presented.

Stimulants available 15 minutes before the talk.

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