Measurement of the muon decay parameter delta Academic Article uri icon


  • The muon decay parameter has been measured by the TWIST collaboration. We find = 0.74964 0.00066)(stat.) 0.00112(syst.), consistent with the standard model value of 3/4. This result implies that the product P of the muon polarization in pion decay, P , and the muon decay parameter falls within the 90% confidence interval 0.9960 < P < 1.0040. It also has implications for left-right-symmetric and other extensions of the standard model. 2005 The American Physical Society.

published proceedings


author list (cited authors)

  • Gaponenko, A., Bayes, R., Davydov, Y. I., Depommier, P., Doornbos, J., Faszer, W., ... Wright, D. H.

citation count

  • 38

complete list of authors

  • Gaponenko, A||Bayes, R||Davydov, YI||Depommier, P||Doornbos, J||Faszer, W||Fujiwara, MC||Gagliardi, CA||Gill, DR||Green, P||Gumplinger, P||Hasinoff, MD||Henderson, RS||Hu, J||Jamieson, B||Kitching, P||Koetke, DD||Krushinsky, AA||Lachin, YY||Macdonald, JA||MacDonald, RP||Marshall, GM||Mathie, EL||Miasoedov, LV||Mischke, RE||Musser, JR||Nord, PM||Nozar, M||Olchanski, K||Olin, A||Openshaw, R||Porcelli, TA||Poutissou, JM||Poutissou, R||Quraan, MA||Rodning, NL||Selivanov, V||Sheffer, G||Shin, B||Sobratee, F||Stanislaus, TDS||Tacik, R||Torokhov, VD||Tribble, RE||Vasiliev, MA||Wright, DH

publication date

  • April 2005