Properties of hadronic decays of the Z boson Page: 2 of 129
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The decays of the Z boson to quarks and subsequently to hadrons were first directly
observed in 1989 with the Mark II detector. This report studies the general properties
of the hadronic events in the initial data sample recorded at center-of-mass energies
near the Z resonance (91.2 GeV).
The preliminary chapters introduce the theoretical framework and the apparatus.
A brief review is given of some features of Quantum Chromodynamics (QCD) that
are relevant to the study. Two QCD-based models that are used to help correct the
data distributions for detector effects and also for comparisons with the corrected
distributions are described. For each of the detector systems used in the analysis, the
design, operation and performance is discussed.
The next chapter describes the event selection which is designed to provide a
sample of well-measured hadronic events. The following three chapters contain the
measured data distributions. The QCD-based models with parameters tuned at
Ecm= 29 GeV describe the 91 GeV data distributions well. Each of these chapters
also shows the variation of the observables as the center-of-mass energy changes.
The event shape variables chosen for study are sphericity, aplanarity, thrust, and
the hemisphere invariant masses. The distributions at 91 GeV show that the majority
of the events are 2-jet-like, with most of the energy confined to two narrow cones
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O'Shaughnessy, K.F. Properties of hadronic decays of the Z boson, report, June 1, 1990; Menlo Park, California. (https://digital.library.unt.edu/ark:/67531/metadc1189233/m1/2/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.