Phys. Rev. D 56, 5320–5329 (1997)

Determination of the Michel parameters and the τ neutrino helicity in τ decay

Abstract

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J. P. Alexander et al. (CLEO Collaboration)
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Received 15 May 1997; published in the issue dated 1 November 1997

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^∓νν̅ decay as well as the τ neutrino helicity parameter h_{ν_τ} in τ^∓→π^∓π⁰ν decay. From a data sample of 3.02×10⁶ produced τ pairs we analyzed events of the topologies e⁺e^-→τ⁺τ^-→(l^±νν̅ )(π^∓π⁰ν) and e⁺e^-→τ⁺τ^-→(π^±π⁰ν̅ )(π^∓π⁰ν). 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevD.56.5320

DOI:

10.1103/PhysRevD.56.5320

PACS:

13.35.Dx, 14.60.Fg

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Phys. Rev. D 56, 5320–5329 (1997)

Determination of the Michel parameters and the τ neutrino helicity in τ decay