"Measurement of the π 0 Lifetime: Probing the QCD Axial Anomaly"Aron Bernstein , Massachusetts Institute of Technology [Host: Dinko Pocanic]
ABSTRACT:
The π 0 lifetime has been measured with significantly improved
accuracy at Jefferson Lab using the Primakoff effect. This was
achieved by careful control of all of the experimental parameters and
included auxiliary measurements of the Compton effect and pair
production. This measurement is a test of a prediction based on the
QCD axial anomaly plus few percent chiral corrections which are
proportional to the mass difference of the up and down quarks. The
basic physics, and a comparison of theory and experiment, will be
presented in the context of spontaneous chiral symmetry breaking in
QCD, some of its physical consequences, and other experimental tests.
SLIDESHOW:
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Colloquium Friday, October 26, 2007 4:00 PM Physics Building, Room 204 Note special time. Note special room. |
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