Precise measurement of parity violation in polarized muon decay Academic Article uri icon


  • We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST Collaboration has measured P, where P is the polarization of the muon in pion decay and describes the intrinsic asymmetry in muon decay. We find P=1.000840.00029(stat.)-0.00063+0.00165(syst.), in good agreement with the standard model prediction of P==1. Our result is a factor of 7 more precise than the pre-TWIST value, setting new limits in left-right symmetric electroweak extensions to the standard model. 2011 American Physical Society.

published proceedings


author list (cited authors)

  • Bueno, J. F., Bayes, R., Davydov, Y. I., Depommier, P., Faszer, W., Gagliardi, C. A., ... Tribble, R. E.

citation count

  • 24

complete list of authors

  • Bueno, JF||Bayes, R||Davydov, Yu I||Depommier, P||Faszer, W||Gagliardi, CA||Gaponenko, A||Gill, DR||Grossheim, A||Gumplinger, P||Hasinoff, MD||Henderson, RS||Hillairet, A||Hu, J||Koetke, DD||MacDonald, RP||Marshall, GM||Mathie, EL||Mischke, RE||Olchanski, K||Olin, A||Openshaw, R||Poutissou, J-M||Poutissou, R||Selivanov, V||Sheffer, G||Shin, B||Stanislaus, TDS||Tacik, R||Tribble, RE

publication date

  • August 2011