Measurement of the muon decay parameter {delta}

Measurement of the muon decay parameter {delta}

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 of 3/4. This result implies that the product P{sub {mu}}{xi} of the muon polarization in pion decay, P{sub {mu}}, and t...

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Veröffentlicht in:Physical review. D, Particles and fields Particles and fields, 2005-04, Vol.71 (7)
Hauptverfasser: Gaponenko, A., Green, P., Kitching, P., MacDonald, R.P., Quraan, M.A., Rodning, N.L., Sobratee, F., Bayes, R., Davydov, Yu. I., Doornbos, J., Faszer, W., Fujiwara, M.C., Gill, D.R., Gumplinger, P., Henderson, R.S., Hu, J., Macdonald, J.A., Marshall, G.M., Mischke, R.E., Nozar, M.
Format: Artikel
Sprache:eng
Schlagworte:
MUONS
PARTICLE DECAY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS
POLARIZATION
STANDARD MODEL
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Zusammenfassung: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 of 3/4. This result implies that the product P{sub {mu}}{xi} of the muon polarization in pion decay, P{sub {mu}}, and the muon decay parameter {xi} falls within the 90% confidence interval 0.9960
ISSN:0556-2821
1089-4918
DOI:10.1103/PhysRevD.71.071101