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Precision muon decay measurements and improved constraints on the weak interaction | | TWIST Collaboration
; A. Hillairet
; J. F. Bueno
; R. Bayes
; Yu. I. Davydov
; P. Depommier
; W. Faszer
; C. A. Gagliardi
; A. Gaponenko
; D. R. Gill
; A. Grossheim
; P. Gumplinger
; M. D. Hasinoff
; R. S. Henderson
; A. Hillairet
; J. Hu
; D. D. Koetke
; R. P. MacDonald
; G. M. Marshall
; E. L. Mathie
; R. E. Mischke
; K. Olchanski
; A. Olin
; R. Openshaw
; J.-M. Poutissou
; R. Poutissou
; V. Selivanov
; G. Sheffer
; B. Shin
; T. D. S. Stanislaus
; R. Tacik
; R. E. Tribble
; | | Date: |
15 Dec 2011 | | Abstract: | The TWIST collaboration has completed its measurement of the three muon decay
parameters $
ho$, $delta$, and $P_muxi$. This paper describes our
determination of $
ho$, which governs the shape of the overall momentum
spectrum, and $delta$, which controls the momentum dependence of the
parity-violating decay asymmetry. The results are $
ho=0.749,77pm
0.000,12( ext{stat.})pm 0.000,23( ext{syst.})$ and $delta = 0.750,49pm
0.000,21( ext{stat.})pm 0.000,27( ext{syst.})$. These are consistent with
the value of 3/4 given for both parameters in the standard model, and each is
over a factor of ten more precise than the measurements published prior to
TWIST. Our final results on $
ho$, $delta$, and $P_muxi$ have been
incorporated into a new global analysis of all available muon decay data,
resulting in improved model-independent constraints on the possible weak
interactions of right-handed particles. | | Source: | arXiv, 1112.3606 | | Services: | Forum | Review | PDF | Favorites | |
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