Supersymmetric jets from Z boson decay and radiative decays of heavy quarkonium
The first part of this thesis is devoted to analysis of the jet structure in the final state of the supersymmetric process [equation]. For scalar quark production, as for supersymmetric events in general, the signature which will enable supersymmetry to be discovered in future colliders is missing energy /momentum combined with certain characteristic jet angular and energy distributions. We study the squark production and decay process at the parton level and carry out a Monte Carlo simulation of the fragmentation of the quarks into jets of hadrons. We also discuss methods which an experimentalist could use to determine the squark and photino masses if confronted with a data sample with characteristics matching the supersymmetric events which we generate. In the second part of the thesis, we examine two-body radiative decays of quarkonium states [equation] in order to study the effects of the spin of the ~ on decay widths; stands for any elementary particle or resonance. Using effective couplings in a calculation which goes beyond the Wilczek aproximation, we find that in all cases examined, Jr = o±, 1 +, 2±, spin has little effect on the ratio [equation] except for masses close to the phase space limit.
supersymmetric jets, Z boson dcay, radiative decay, heavy quarkonium, scalar quark production
University of Illinois - Urbana-Champaign
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