A precision measurement of the muon decay parameter delta

Details A precision measurement of the muon decay parameter delta A precision measurement of the muon decay parameter delta

2011-04-14

arxiv.org/abs/1104.2914v1

Physics

High Energy Physics

High Energy Physics - Experiment

This PhD dissertation uses first data from the TWIST experiment. It was defended several years ago, but was not easy to find.

Scientific paper

The muon decay parameter delta characterizes momentum dependence of the parity-violating muon decay asymmetry. A new measurement of delta has been performed using the first physics data recorded by the TWIST experiment at TRIUMF. The obtained value, delta=0.74964+-0.00066(stat.)+-0.00112(syst.), is consistent with the Standard Model expectation delta=3/4. This is the first determination of delta performed using a blind analysis technique. Combined with other data, the measurement sets new model-independent limits on effective right-handed couplings of the muon. Improved limits on the product of another muon decay parameter, xi, and the muon polarization in pion decay, Pmu, are obtained in the form: 0.9960

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