Determination of the Michel parameters and the τ neutrino helicity in τ decay
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Issue Date
1997-11-01Author
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Darling, C.
Davis, Robin E. P.
Hancock, N.
Kotov, S.
Kravchenko, I.
Kwak, Nowhan
Publisher
American Physical Society
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
Using the CLEO II detector at the Cornell Electron Storage Ring operated at s√=10.6GeV, we have determined the Michel parameters ρ, ξ, and δ in τ(∓)→l(∓)νν¯ decay as well as the τ neutrino helicity parameter hντ in τ(∓)→π(∓)π(0)ν decay. From a data sample of 3.02×106 produced τ pairs we analyzed events of the topologies e(+)e(-)→τ(+)τ(-)→(l(±)νν¯)(π(∓)π(0)ν) and e(+)e(-)→τ(+)τ(-)→(π(±)π(0)ν¯)(π(∓)π(0)ν). We obtain ρ=0.747ρ=0.747±0.010±0.006, ξ=1.007±0.040±0.015, ξδ=0.745±0.026±0.009, and h(ν)(τ)=-0.995±0.010±0.003, where we have used the previously determined sign of h(ν)(τ) [ARGUS Collaboration, H. Albrecht et al., Z. Phys. C 58, 61 (1993); Phys. Lett. B 349, 576 (1995)]. We also present the Michel parameters as determined from the electron and muon samples separately. All results are in agreement with the standard model V-A interaction.
Description
This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.56.5320.
ISSN
1550-7998Collections
Citation
J. P. Alexander et al. ((CLEO Collaboration)). (1997). "Determination of the Michel parameters and the τ neutrino helicity in τ decay." Physical Review D, 56(9):5320. http://dx.doi.org/10.1103/PhysRevD.56.5320
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