Particles, Astrophysics, and Nuclear Physics Seminar
Measurement of the Neutral Pion Lifetime
The lifetime of the neutral pion has a long history from both the theoretical and experimental point of view. Since there are no hadronic states lighter than the π0 its strong decay is not allowed. Still its short lifetime (of order 10-16&ndsp;s) made direct observation of a finite decay distance impossible for 35 years after its discovery. The first theory of its decay emerged in the 1960s and concluded that it should be a stable particle. Currently, the most accurate experiment and most modern theoretical calculations are in marginal disagreement. The PrimEx experiment at Jefferson Lab uses an indirect method, the Primakoff effect, to infer the lifetime with unprecedented precision. Preliminary results from PrimEx will be presented and the experimental outlook discussed.
Monday, October 8, 2007
Gant Science Complex