Drift chambers for a precision measurement of the Michel parameters in muon decay

Davydov, Yu. I.; Andersson, W.; Comyn, M.; Depommier, P.; Doornbos, J.; Faszer, W.; Gagliardi, C. A.; Gill, D. R.; Green, P.; Gumplinger, P.; Hardy, J. C.; Hasinoff, M.; Helmer, R. L.; Henderson, R.; Khruchinsky, A.; Kitching, P.; Koetke, D. D.; Korkmaz, E.; Lachin, Yu.Yu.; Maas, D.; Macdonald, J. A.; MacDonald, R.; Manweiler, R.; Marshall, G. M.; Mathie, E. L.; Miassoedov, L.; Musser, J.; Nord, P. M.; Olin, A.; Openshaw, R.; Ottewell, D.; Porcelli, T. A.; Poutissou, J. M.; Poutissou, R.; Price, G.; Quraan, Maher A.; Rodning, N.; Schaapman, J.; Selivanov, V. I.; Sheffer, Gabriel; Shin, B. K.; Sobratee, F.; Soukup, J.; Stanislaus, T. D. S.; Stinson, G. M.; Tacik, R.; Torokhov, V.; Tribble, R. E.; Vasiliev, M. A.; Walter, H. C.; Wright, D. H.

doi:10.1016/s0168-9002(00)01170-0

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The beam also contained several times as many positrons as muons, with the ratio varying with different tuning conditions. After passing through the beam line, the muons stopped at a rate between 2000 s À1 and 5000 s À1 in a thin target foil located in the center of the highly symmetric array of 44 planar drift chambers (DCs) [13] and 12 planar proportional chambers (PCs) composing the TWIST detector (Fig. 2).…”

Section: Experimental Setup a Twist Spectrometermentioning

confidence: 99%

Precision muon decay measurements and improved constraints on the weak interaction

Hillairet¹,

Bayes²,

Bueno³

et al. 2012

Phys. Rev. D

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The TWIST Collaboration has completed its measurement of the three muon decay parameters , , and P . This paper describes our determination of , which governs the shape of the overall momentum spectrum, and , which controls the momentum dependence of the parity-violating decay asymmetry. The results are ¼ 0:749 77 AE 0:000 12ðstatÞ AE 0:000 23ðsystÞ and ¼ 0:750 49 AE 0:000 21ðstatÞ AE 0:000 27ðsystÞ. These are consistent with the value of 3=4 given for both parameters in the standard model, and each is over a factor of 10 more precise than the measurements published prior to TWIST. Our final results on , , and P have been incorporated into a new global analysis of all available muon decay data, resulting in improved modelindependent constraints on the possible weak interactions of right-handed particles.

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Section: Experimental Setup a Twist Spectrometermentioning

confidence: 99%

Precision muon decay measurements and improved constraints on the weak interaction

Hillairet¹,

Bayes²,

Bueno³

et al. 2012

Phys. Rev. D

Self Cite

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“…Each DC plane [14] included 80 sense wires at 4 mm pitch. The DC planes were very slightly asymmetric in the direction along the detector axis, in that the wires were located 150 m off of the center of the cell.…”

Section: Experimental Procedures a Experimental Setupmentioning

confidence: 99%

Precision measurement of the muon decay parametersρandδ

MacDonald¹,

Bayes²,

Bueno³

et al. 2008

Phys. Rev. D

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The TWIST Collaboration has performed new measurements of two of the parameters that describe muon decay: , which governs the shape of the overall momentum spectrum, and , which governs the momentum dependence of the parity-violating decay asymmetry. This analysis gives the results ¼ 0:750 14 AE 0:000 17ðstatÞ AE 0:000 44ðsystÞ AE 0:000 11ðÞ, where the last uncertainty arises from the correlation between and the decay parameter , and ¼ 0:750 67 AE 0:000 30ðstatÞ AE 0:000 67ðsystÞ. These are consistent with the value of 3=4 given for both parameters in the standard model of particle physics, and are a factor of two more precise than the measurements previously published by TWIST. A new global analysis of all available muon decay data incorporating these results is presented. Improved lower and upper limits on the decay parameter P of 0:995 24 < P < 1:000 91 at 90% confidence are determined, where P is the polarization of the muon when it is created during pion decay, and governs the muon decay asymmetry. These results set new model-independent constraints on the possible weak interactions of right-handed particles. Specific implications for left-right symmetric models are discussed.

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Effects of materials on aging rates in wire chambers operated with DME

Openshaw

Henderson

2003

Nuclear Instruments and Methods in Physics Research Section A:

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Drift chambers for a precision measurement of the Michel parameters in muon decay

Cited by 5 publications

References 3 publications

Precision muon decay measurements and improved constraints on the weak interaction

Precision muon decay measurements and improved constraints on the weak interaction

Precision measurement of the muon decay parametersρandδ

Effects of materials on aging rates in wire chambers operated with DME

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