Measurement of the parameter xi" in polarized muon decay and Implications on exotic couplings of the leptonic weak interaction

R. Prieels 1 O. Naviliat-Cuncic 2, 3 P. Knowles 1 P. Van Hove 1 X. Morelle J. Egger J. Deutsch 1 J. Govaerts 1 W. Fetscher K. Kirch J. Lang
1 UCL - Université Catholique de Louvain
2 LPCC - Laboratoire de physique corpusculaire de Caen
3 NSCL - National Superconducting Cyclotron Laboratory
Abstract : The muon decay parameter ξ'' has been determined in a measurement of the longitudinal polarization of positrons emitted from polarized and depolarized muons. The result, ξ''=0.981±0.045stat±0.003syst, is consistent with the Standard Model prediction of unity, and provides an order of magnitude improvement in the relative precision of this parameter. This value sets new constraints on exotic couplings beyond the dominant V−A description of the leptonic weak interaction.
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Physical Review D, American Physical Society, 2014, 90, pp.112003. 〈10.1103/PhysRevD.90.112003〉
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Contributeur : Sandrine Guesnon <>
Soumis le : jeudi 4 décembre 2014 - 09:43:23
Dernière modification le : mardi 24 avril 2018 - 01:46:08

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R. Prieels, O. Naviliat-Cuncic, P. Knowles, P. Van Hove, X. Morelle, et al.. Measurement of the parameter xi" in polarized muon decay and Implications on exotic couplings of the leptonic weak interaction. Physical Review D, American Physical Society, 2014, 90, pp.112003. 〈10.1103/PhysRevD.90.112003〉. 〈in2p3-01090724〉

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