A measurement of the tau Michel parameters at SLD
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
This thesis presents a measurement of the tau Michel parameters. This measurement utilizes the highly polarized SLC electron beam to extract these quantities directly from the measured tau decay spectra using the 1993--95 SLD sample of 4,528 tau pair events. The results are ρe = 0.71 ± 0.14 ± 0.05, ζe = 1.16 ± 0.52 ± 0.06, and (ζδ)e = 0.85 ± 0.43 ± 0.08 for tau decays to electrons and ρμ = 0.54 ± 0.28 μ 0.14, ημ = -0.59 ± 0.82 ± 0.45, ζsup>μ = 0.75 ± 0.50 ± 0.14, and (ζδ)μ = 0.82 ± 0.32 ± 0.07 for tau decays to muons. Combining all leptonic tau decays gives ρ = 0.72 ± 0.09 ± 0.03, ζ = 1.05 ± 0.35 ± 0.04, and ζδ = 0.88 ± 0.27 ± 0.04. These results agree well with the current world average and the Standard Model.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 515578
- Report Number(s):
- SLAC-R-506; ON: DE97008277; TRN: 97:014859
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of the {ital {tau}} Neutrino Helicity and Michel Parameters in Polarized {ital e}{sup +}{ital e}{sup -} Collisions
Tau Lorentz Structure with Polarization at SLD