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A precision measurement of the muon decay parameter delta
TLDR
In this article, a measurement of delta was performed using the first physics data recorded by the TWIST experiment at TRIUMF, and the obtained value, delta=0.74964+-0.00066+−0.00112(syst.), is consistent with the Standard Model expectation delta=3/4.Abstract:
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<Pmu*xi<=xi<1.0040, at 90% confidence level. Implications for left-right symmetric models are discussed.read more
Citations
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Journal ArticleDOI
Measurement of P{sub {mu}}{xi} in polarized muon decay
B. Jamieson,R. Bayes,Yu. I. Davydov,P. Depommier,J. Doornbos,W. Faszer,M. C. Fujiwara,C. A. Gagliardi,A. Gaponenko,D. R. Gill,P. Gumplinger,M. D. Hasinoff,R. S. Henderson,J. Hu,P. Kitching,D. D. Koetke,J. A. Macdonald,R. P. MacDonald,Glenn M. Marshall,E. L. Mathie,R. E. Mischke,J. R. Musser,M. Nozar,K. Olchanski,A. Olin,R. Openshaw,T. A. Porcelli,J. M. Poutissou,R. Poutissou,M. A. Quraan,N. L. Rodning,V. Selivanov,G. Sheffer,B. Shin,T. D. S. Stanislaus,R. Tacik,V. D. Torokhov,R. E. Tribble,M. A. Vasiliev +38 more
TL;DR: In this article, the authors measured the degree of muon polarization in pion decay and obtained a value P{sub {mu}}{sup {pi}}{xi}=1.0003{+-}0.0006(stat.){+ − 0.0038(syst.) was obtained.
Dissertation
Positron-neutrino correlation measurements in the beta decay of magneto-optically trapped 38mK atoms
TL;DR: In this article, the angular correlation between the positron and the neutrino emitted in the beta decay of the isomer 38mK was measured using a magneto-optical trap located between two detectors.
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Measurement of the Michel Parameters {rho} with the MEGA positron spectrometer
TL;DR: In this article, the energies of decay positions were measured with the existing MEGA positron spectrometer, which consists of 180 strips of plastic scintillator forming two hollow barrels and 8 cylindrically shaped MWPCs arranged such that seven smaller ones surround a larger central one.
Dissertation
Search for exotic muon decays in the TWIST muon decay spectrum
TL;DR: Olin and Kowalewski as discussed by the authors used the TWIST experiment at TRIUMF to search for lepton flavour violation between charged lepton species, and set branching ratios for these decays such that B(μ → eX) < 2 × 10 − 5 × 10, for X of various masses accessable by the momenta of the muon decay spectrum, to a confidence level of 95%.
References
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TL;DR: The left-right symmetry of the starting gauge interactions is a "natural" symmetry if it is broken in no way except possibly by mass terms in the Lagrangian as mentioned in this paper.
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