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open access

A search for z boson pair production at the Fermilab Tevatron Collider

Description: This dissertation describes a search for Z/{gamma}* boson pair production decaying into {mu}{mu}{mu}{mu}, {mu}{mu}ee, and eeee final states with approximately 1 fb{sup -1} of data at the Fermilab Tevatron Collider at {radical}s = 1.96 TeV. The small cross section times branching ratio for each channel mandated a thorough study of the acceptance and efficiencies. After optimization, 1.7 {+-} 0.1 events are expected for Standard Model production with a background of 0.13 {+-} 0.03 events. One eve… more
Date: October 1, 2007
Creator: Jarvis, Chad Ryan
Partner: UNT Libraries Government Documents Department
open access

Search for stop pairs in the emu channel

Description: The Standard Model gives a satisfying description of subatomic processes at low energy (< 1 TeV). Beyond this energy scale, other models must be considered. Supersymmetry is one of them. It gives in an elegant way, solutions to several Standard Model short comings. This document reports the search for a supersymmetric signal characterized by the production of two stops decaying into two b-jets, one electron, one muon and missing energy. This study has been performed at the D0 experiment, loc… more
Date: October 1, 2007
Creator: Tissandier, Fabrice & U., /Clermont-Ferrand
Partner: UNT Libraries Government Documents Department
open access

Development and Integration of Hardware and Software for Active-Sensors in Structural Monitoring

Description: Structural Health Monitoring (SHM) promises to deliver great benefits to many industries. Primarily among them is a potential for large cost savings in maintenance of complex structures such as aircraft and civil infrastructure. However, several large obstacles remain before widespread use on structures can be accomplished. The development of three components would address many of these obstacles: a robust sensor validation procedure, a low-cost active-sensing hardware and an integrated softwar… more
Date: October 15, 2007
Creator: Overly, Timothy G.S.
Partner: UNT Libraries Government Documents Department
open access

Galaxy Evolution Insights from Spectral Modeling of Large Data Sets from the Sloan Digital Sky Survey

Description: This thesis centers on the use of spectral modeling techniques on data from the Sloan Digital Sky Survey (SDSS) to gain new insights into current questions in galaxy evolution. The SDSS provides a large, uniform, high quality data set which can be exploited in a number of ways. One avenue pursued here is to use the large sample size to measure precisely the mean properties of galaxies of increasingly narrow parameter ranges. The other route taken is to look for rare objects which open up for ex… more
Date: October 1, 2007
Creator: Hoversten, Erik A.
Partner: UNT Libraries Government Documents Department
open access

A RANS/DES Numerical Procedure for Axisymmetric Flows with and without Strong Rotation

Description: A RANS/DES numerical procedure with an extended Lax-Wendroff control-volume scheme and turbulence model is described for the accurate simulation of internal/external axisymmetric flow with and without strong rotation. This new procedure is an extension, from Cartesian to cylindrical coordinates, of (1) a second order accurate multi-grid, control-volume integration scheme, and (2) a k-{omega} turbulence model. This paper outlines both the axisymmetric corrections to the mentioned numerical schem… more
Date: October 30, 2007
Creator: Andrade, A J
Partner: UNT Libraries Government Documents Department
open access

Performance-Driven Interface Contract Enforcement for Scientific Components

Description: Performance-driven interface contract enforcement research aims to improve the quality of programs built from plug-and-play scientific components. Interface contracts make the obligations on the caller and all implementations of the specified methods explicit. Runtime contract enforcement is a well-known technique for enhancing testing and debugging. However, checking all of the associated constraints during deployment is generally considered too costly from a performance stand point. Previous … more
Date: October 1, 2007
Creator: Dahlgren, T L
Partner: UNT Libraries Government Documents Department
open access

Measurement of the relative fraction of ttbar events produced via gluon fusion in ppbar collision at s**(1/2) = 1.96 TeV at CDF

Description: In this thesis we present a measurement of the relative fraction of t{bar t} events produced via gluon-fusion to the total number of t{bar t} events. Using the kinematics of the production and decay of the top and antitop quark pair, we trained a Neural Network to discriminate the gluon-fusion events. The Neural Network was then used as a template to fit for the gluon-fusion fraction in data. Using a total integrated luminosity of 955 pb{sup -1} we find {sigma}(gg{yields}t{bar t})/{sigma}(p{bar… more
Date: October 1, 2007
Creator: Yamaoka, Jared Andrew
Partner: UNT Libraries Government Documents Department
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