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Determination of the Michel parameters and the τ neutrino helicity in τ decay
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.
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.
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Abstract
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.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.56.5320.
Date
1997-11-01
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American Physical Society
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Baringer_11-1-1997.pdf
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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