University of Illinois Urbana-Champaign

A MEASUREMENT OF Rμ = σ(W → μv)/σ(Z^0→ μ^+ μ^-) IN PP ̅ COLLISIONS AT √S = 1.8 TEV

Swartz, Raymond Lee

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Description

Title
A MEASUREMENT OF Rμ = σ(W → μv)/σ(Z^0→ μ^+ μ^-) IN PP ̅ COLLISIONS AT √S = 1.8 TEV
Author(s)
Swartz, Raymond Lee
Issue Date
1994
Doctoral Committee Chair(s)
Errede, Steven M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • time branching ratios
  • computational physics
  • electron channel
  • Standard Model
  • Lepton universality
Language
en
Abstract
A measurement in the muon channel of the ratio of W and Z production cross sections times branching ratios yields Rμ = σ(W → μv)/σ(Z^0→ μ^+ μ^-) = 9.8 ± 1.1(stat) ± 0.4(syst), where the statistics of the Z sample is the dominant uncertainty. The individual cross sections times branching ratios are σ(pp ̅ → W → μv) = 2.21 ± 0.07(stat) ± 0.14(syst) ± 0.15(lum) nb and σ(pp ̅ → Z^0→ μ^+ μ^-) = 0.226 ± 0.022( stat)± 0.018( syst) ± 0.015( lum) nb. Combining with previous CDF results in the electron channel yields the overall results R_1 = 10.0 ± 0.6(stat) ± 0.4(syst), σ(W → lv) = 2.21 ± 0.04(stat) ± 0.13(syst) ± 0.15(lum) nb, and σ(Z^0→ ll) = 214 ± 11(stat) ± 14(syst) ± 15(lum) pb. Using Standard Model assumptions we deduce the W inverse branching ratio and width, and a lower bound on the top quark mass of 45 GeV / c^2 (95% CL) which is independent of the decay mode. Lepton universality is confirmed in this energy domain. All results are in agreement with standard model predictions.
Type of Resource
text
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http://hdl.handle.net/2142/18881
Copyright and License Information
1994 Raymond Lee Swartz

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