A Measurement of the Tau Michel Parameters at SLD [Thesis]

Technical Report · Fri May 02 04:00:00 EDT 1997

DOI:https://doi.org/10.2172/1454178· OSTI ID:1454178

Quigley, James A. ^[1]

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1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); 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 4528 tau pair events. The results are p^e = 0.71±0.14±0.05, ξ^c= 1.16±0.52±0.06, and (ξδ)^e= 0.85±0.43±0.08 for tau decays to electrons and p^μ = 0.54±0.28±0.14, η^μ= -0.59±0.82±0.45, ξ^μ = 0.75±0.50±0.14, and (ξδ)^μ = 0.82±0.32±0.07 for tau decays to muons. Combining all leptonic tau decays gives p = 0.72±0.09±0.03, ξ = 1.05±0.35±0.04, and ξδ = 0.88±0.27±0.04. These results agree well with the current world average and the Standard Model.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1454178
• Report Number(s): SLAC-R-506
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS