Speaker
Dr
Glen Marshall
(TRIUMF)
Description
Muon decay offers an opportunity to test the Standard Model
of particle physics in a purely leptonic situation where
more ambiguous strong interaction processes are absent. The
TRIUMF Weak Interaction Symmetry Test (TWIST) was designed
specifically to improve by an order of magnitude the
precision of the decay parameters $\rho$, $\delta$, and $P_{\mu}\xi$
derived from energy and angle distributions of positrons
from polarized positive muon decay. It tests the V-A
structure of muon decay by comparing the parameters to those
predicted by the Standard Model in an analysis permitting
more general Lorentz-invariant local terms.
Data taking was completed in 2007. The subsequent blind
analysis has focused on reducing systematic uncertainties,
estimating residual biases, and evaluating consistency
checks. The results, dominated by the systematic
uncertainties, have been further scrutinized for
self-consistency.
The talk will describe the experimental apparatus and
analysis procedures, with particular attention to the
reduction of leading systematic uncertainties. The final
results and their uncertainties will be presented along with
implications for physics beyond the Standard Model.
Primary author
Dr
Glen Marshall
(TRIUMF)
Co-author
. (representing the TWIST Collaboration)
(.)
