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Title:Measurement of R[mu]=[sigma](W[right arrow][mu][nu])/[sigma](Z0[right arrow][mu]+[mu]-)INP[bar]P collisions at [square root]S=1.8TEV
Author(s):Swartz, Raymond Lee
Doctoral Committee Chair(s):Errede, Steven M.
Department / Program:Physics
Subject(s):time branching ratios
computational physics
electron channel
Standard Model
Lepton universality
Abstract:A measurement in the muon channel of the ratio of W and Z production cross sections times branching ratios yields 'R#J = u(W-+ p.v)lu(Z0 -+ p.+ p.-) = 9.8 ± 1.1(&tat) ± 0.4(&y&t), where the statistics of the Z sample is the dominant uncertainty. The individual cross sections times branching ratios are u(pfi-+ W -+ p.v) = 2.21 ± 0.07(&tat) ± 0.14(&y&t) ± 0.15(lum) nb and u(pfi -+ Z0 -+ p.+ p.-) = 0.226 ± 0.022( stat)± 0.018( &y&t) ± 0.015( lum) nb. Combining with previous CDF results in the electron channel yields the overall results 'Rt = 10.0 ± 0.6(&tat) ± 0.4(syst), u(W -+ lv) = 2.21 ± 0.04(&tat) ± 0.13(syst) ± 0.15(lum) nb, and u(Z0 -+ ll) = 214 ± ll(stat) ± 14(&y&t) ± 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 Ge VI c2 (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.
Issue Date:1994
Genre:Dissertation / Thesis
Rights Information:1994 Raymond Lee Swartz
Date Available in IDEALS:2011-04-26
Identifier in Online Catalog:3779583

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