A MEASUREMENT OF Rμ = σ(W → μv)/σ(Z^0→ μ^+ μ^-) IN PP ̅ COLLISIONS AT √S = 1.8 TEV
type: CreativeWork
description: 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.
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.
author: Swartz, Raymond Lee
language: en
keywords: time branching ratios, computational physics, electron channel, Standard Model, Lepton universality
date published: 2011-04-26T17:06:33Z
date modified: 2026-07-22T22:25:11Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois - Urbana-Champaign

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property ID: Handle
value: http://hdl.handle.net/2142/18881