Colloquia

Colloquium
Friday, October 26, 2007
4:00 PM
Physics Building, Room 204
Note special time.

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"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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