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Determination of the Michel parameters and the tau-neutrino helicity in tau decay

Collaboration
May, 1997
18 pages
Published in:
  • Phys.Rev.D 56 (1997) 5320-5329
e-Print:
DOI:
Report number:
  • SLAC-PUB-9780,
  • CLNS-97-1480,
  • CLEO-97-9
Experiments:
  • CESR-CLEO-II
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Abstract:
Using the CLEO II detector at the e +e −e~+e~- storage ring CESR, we have determined the Michel parameters ρ\rho, ξ\xi, and δ\delta in τ ∓→l ∓ννˉ\tau~\mp \to l~\mp\nu\bar{\nu} decay as well as the tau neutrino helicity parameter hντh_{\nu_\tau} in τ ∓→π ∓π 0ν\tau~\mp \to \pi~\mp\pi~0\nu decay. From a data sample of 3.02×10 63.02\times 10~6 tau pairs produced at s=10.6GeV\sqrt{s}=10.6 GeV, using events of the topology e +e −→τ +τ −→(l ±ννˉ)(π ∓π 0ν)e~+e~- \to \tau~+\tau~- \to (l~\pm\nu\bar{\nu}) (\pi~\mp\pi~0\nu) and e +e −→τ +τ −→(π ±π 0νˉ)(π ∓π 0ν)e~+e~- \to \tau~+\tau~- \to (\pi~\pm\pi~0\bar{\nu}) (\pi~\mp\pi~0\nu), and the determined sign of hντh_{\nu_\tau}, the combined result of the three samples is: ρ=0.747±0.010±0.006\rho = 0.747\pm 0.010\pm 0.006, ξ=1.007±0.040±0.015\xi = 1.007\pm 0.040\pm 0.015, ξδ=0.745±0.026±0.009\xi\delta = 0.745\pm 0.026\pm 0.009, and hντ=−0.995±0.010±0.003h_{\nu_\tau} = -0.995\pm 0.010\pm 0.003. The results are in agreement with the Standard Model V-A interaction.
  • 14.60.Fg
  • 13.35.Dx
  • electron positron: colliding beams
  • electron positron: annihilation
  • tau: electroproduction
  • tau: pair production
  • tau: semileptonic decay
  • tau: leptonic decay
  • neutrino/tau: helicity
  • Michel parameter
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