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published_or_final_version / abstract / Physics / Master / Master of Philosophy

In this dissertation we investigate the question that high energy irregular rapidity events can be generated by finite samples of one dimensional fractal structures. The idea is basically to generate a rapidity histogram by transforming a one-dimensional map of which the histogram is known and simple a one-dimensional map with the desired histogram. Then studying the system in different dynamical regimes we analyse the properties of factorial moments, cumulants and multifractal properties. It is useful to have such models in the sense that one then has a direct ability to check some of the quantitative features that can be distinguished from each other because they refer to different dynamical regimes (i.e. intermittency and chaos). In studying such models we analyse the qualitative and quantitative features of the question of hadronic intermittency in comparison with the same features in those models both theoretically and experimentally. We finally made an analogy with the field theory formalism of hadron production and Quantum Optics in which the question of regularity vs. irregularity has been asked much earlier.

This thesis presents the detailed measurements of the tracking efficiency of the BaBar detector using T pair events. These efficiency measurements are critical for many physics analyses at BaBar. The tracking efficiency is dctcrmined both as a global valuc for the detector and in terms of the parameters on which the BaBar tracking reconstruction software depends. In addition, the charge asymmetry of the tracking efficiency as well as a detailed analysis of the systematic uncertainties related to this method are also presented. It was discovered that the sample of data conventionally used by BaBar for measuring the efficiency is contaminated by background and a ncw protocol for measuring thc cfficicncies is presented. Undcr this new protocol, the global tracking efficiency correction factor and the global tracking efficiency charge asymmetry are determined to be consistent with zero. A new method for determining the efficiency as a function of the reconstruction parameters, was also successfully demonstrated.

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