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Measuring the Michel parameter ξ''

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Abstract

Unlike the majority of Michel parameters which are consistent with the Standard Model V-A interaction, the experimental value of ξ″(=0.65±0.36) [1] is poorly known. Our experiment will measure the longitudinal polarization, P L , of positrons emitted from the decay of polarized muons. The value of P L , equal to unity in the Standard Model, will decrease for high energy positrons emitted antiparallel to the muon spin if the combination of Michel parameters ξ″/ξξ′ − 1 deviates from the Standard Model value of zero.

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Authors and Affiliations

  1. Institut de Physique, Université de Fribourg, Pérolles, CH-1700, Fribourg, Switzerland

    P. Knowles

  2. Université, Catholique de Louvain, Belgium

    J. Deutsch, J. Govaerts, A. Ninane, R. Prieels, N. Severijns & P. Van Hove

  3. Paul Scherrer Institut, Switzerland

    J. Egger, F. Foroughi, K. Kirch, S. Kistryn & L. Simons

  4. Institut für Teilchenphysik, ETHZ, Switzerland

    W. Fetscher, M. Hadri, J. Lang, X. Morelle, O. Naviliat, J. Sromicki & S. Vandormael

Authors
  1. P. Knowles
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  2. J. Deutsch
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  3. J. Egger
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  4. W. Fetscher
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  5. F. Foroughi
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  6. J. Govaerts
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  7. M. Hadri
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  8. K. Kirch
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  9. S. Kistryn
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  10. J. Lang
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  11. X. Morelle
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  12. O. Naviliat
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  13. A. Ninane
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  14. R. Prieels
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  15. N. Severijns
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  16. L. Simons
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  17. J. Sromicki
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  18. S. Vandormael
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  19. P. Van Hove
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Knowles, P., Deutsch, J., Egger, J. et al. Measuring the Michel parameter ξ''. Hyperfine Interactions 118, 73–76 (1999). https://doi.org/10.1023/A:1012632518939

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  • DOI: https://doi.org/10.1023/A:1012632518939

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