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Title: A measurement of the Z boson transverse momentum distribution, and of the ZZ and WZ production cross sections using 7.3-8.6 fb⁻¹ of pp̄ collisions at √s = 1.96 TeV
Author: Vesterinen, Mika
ISNI:       0000 0004 0132 9115
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2012
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Two analyses are performed with the large samples of dielectron and dimuon events collected by the D0 experiment at the Fermilab Tevatron pp̄ collider. The dilepton transverse momentum (pT) distribution in Z/γ*→e⁺e⁻ production is a powerful probe of Quantum chromodynamics. Until now, this distribution has been measured with limited precision. An alternative variable, Φ*η, is proposed due to its relatively low susceptibility to detector effects. The Φ*η distribution of events with Z/γ*→e⁺e⁻ invariant masses between 70 and 110 GeV, is measured in three bins of dilepton rapidity. This measurement, with 7.3 fb⁻¹ of data, is significantly more precise than previous measurements of the pT distribution. A state-of-the-art QCD Monte Carlo program is in modest agreement with the data. Using 8.6 fb⁻¹ of data, the ZZ/γ*→vve⁺e⁻ and WZ/γ*→eve⁺e⁻ processes are studied, yielding production cross sections of, σ(pp̄→ZZ/γ*) = 1.64 ± 0.46 pb and σ(pp̄→WZ/γ*) = 4.46 ± 0.64 pb, for Z/γ*→e⁺e⁻ invariant masses between 60 and 130 GeV. These are in agreement with Standard Model predictions.
Supervisor: Wyatt, Terence Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available