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Publications (6)

hep-ex2011

Precise measurement of parity violation in polarized muon decay

TWIST Collaboration, J. F. Bueno, R. Bayes +28

We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST collaboration has measured $P_{I^} ¼^{I ¨} I^¾$ , where $P_Î¼^Ï…

hep-ex2004

Measurement of the Michel Parameter $I ¨ $ in Muon Decay

TWIST Collaboration, J. R. Musser

The TWIST Collaboration has measured the Michel parameter $I ¨ $ in normal muon decay, $I^¼^{+} \to e^{+} I^½_{e} I^ˉ ½_{I^} ¼$ . In the Standard Model, $I ¨ $ = 3/4. Deviations from this value re…

hep-ex2005

Measurement of the Muon Decay Parameter delta

TWIST Collaboration, A. Gaponenko, R. Bayes +45

The muon decay parameter delta has been measured by the TWIST collaboration. We find delta = 0.74964 +- 0.00066(stat.) +- 0.00112(syst.), consistent with the Standard Model value o…

hep-ex2006

Measurement of P_{mu}xi in Polarized Muon Decay

TWIST Collaboration, B. Jamieson, R. Bayes +37

The quantity P_{mu}^{pi}xi, where xi is one of the muon decay parameters and $P_{I^} ¼^{I ¨} $ is the degree of muon polarization in pion decay, has been measured. The value P_{mu}^{pi}xi…

hep-ex2012

Precision muon decay measurements and improved constraints on the weak interaction

TWIST Collaboration, A. Hillairet, R. Bayes +28

The TWIST Collaboration has completed its measurement of the three muon decay parameters Ï, Î´, and P_Î¼Î¾. This paper describes our determination of Ï, which governs the shape o…

hep-ex2008

A Precision Measurement of the Muon Decay Parameters $I ¨ $ and $I^´$

TWIST Collaboration, R. P. MacDonald, R. Bayes +34

The TWIST collaboration has performed new measurements of two of the parameters that describe muon decay: $I ¨ $ , which governs the shape of the overall momentum spectrum, and $I^´$ ,…