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Measurement of the Diphoton Differential Cross Section in p anti-p Collisions at s**(1/2) = 1.96-TeV

Description: The diphoton differential cross-section as a function of mass up to 300 GeV/c{sup 2}, q{sub T} up to 100 GeV/c, and opening angle over a range of 0 to {pi} radians is measured. The measurement is performed using 1046.19 pb{sup -1} of data collected at Fermi National Accelerator Laboratory using the D0 detector. This analysis considers all direct diphoton states but attempts to suppress contributions due to fragmentation.
Date: January 1, 2007
Creator: Dyer, Joshua Marc
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Top Quark Mass using Dilepton Events and a Neutrino Weighting Algorithm with the D0 Experiment at the Tevatron (Run II)

Description: Elementary particle physics raises questions that are several thousand years old. What are the fundamental components of matter and how do they interact? These questions are linked to the question of what happened in the very first moments after the creation of the universe. Modern physics systematically tests nature to find answers to these and other fundamental questions. Precise theories are developed that describe various phenomena and at the same time are reduced to a few basic principals … more
Date: January 1, 2007
Creator: Meyer, Joerg
Partner: UNT Libraries Government Documents Department
open access

Determination of W boson helicity fractions in top quark decays in p anti-p collisions at CDF Run II and production of endcap modules for the ATLAS Silicon Tracker

Description: The thesis presented here includes two parts. The first part discusses the production of endcap modules for the ATLAS SemiConductor Tracker at the University of Geneva. The ATLAS experiment is one of the two multi-purpose experiments being built at the LHC at CERN. The University of Geneva invested extensive efforts to create an excellent and efficient module production site, in which 655 endcap outer modules were constructed. The complexity and extreme requirements for 10 years of LHC operatio… more
Date: January 1, 2007
Creator: Moed, Shulamit & U., /Geneva
Partner: UNT Libraries Government Documents Department
open access

Precision Measurement of the Mass of the Top Quark in p anti-p Collisions

Description: We report a measurement of the mass of the top quark (m{sub top}) in p{bar p} collisions at a center of mass energy of 1.96 TeV. The analysis is based on p{bar p}{yields}t{bar t}{yields} lepton+jets data recorded with the D0 detector at the Fermilab Tevatron Collider. Events were preselected in the e+jets (913 events/pb of data) and in the {mu}+jets (871 events/pb of data) channels. These were analyzed through a comparison of the matrix element for the production and decay of the t{bar t} state… more
Date: January 1, 2007
Creator: Garcia, Carlos A.
Partner: UNT Libraries Government Documents Department
open access

Atmospheric electron neutrinos in the MINOS far detector

Description: Neutrinos produced as a result of cosmic-ray interactions in the earth's atmosphere offer a powerful probe into the nature of this three-membered family of low-mass, weakly-interacting particles. Ten years ago, the Super-Kamiokande Experiment has confirmed earlier indications that neutrinos undergo lepton-flavor oscillations during propagation, proving that they are massive contrary to the previous Standard Model assumptions. The Soudan Underground Laboratory, located in northern Minnesota, was… more
Date: January 1, 2007
Creator: Speakman, Benjamin Phillip
Partner: UNT Libraries Government Documents Department
open access

Measurement of the w boson mass at the Collider Detector at Fermilab from a fit to the transverse momentum spectrum of the muon

Description: This thesis describes a measurement of the W boson mass from a fit to the transverse momentum spectrum of the muon in W decay. In past measurements this technique was used as a cross-check, however, now presents the best method in terms of systematic uncertainty. We discuss all sources of systematic uncertainty with emphasis on those to which the muon p{sub T} measurement is particularly sensitive, specifically, those associated with modeling the production and decay of W bosons. The data were … more
Date: January 1, 2007
Creator: Vollrath, Ian Eberhard & U., /Toronto
Partner: UNT Libraries Government Documents Department
open access

Search for gluino and squark production in multi-jets plus missing transverse energy final states at the Tevatron using the CDF detector

Description: In this thesis, the results of the search for squarks and gluinos in multiple jets plus missing transverse energy final states have been presented. No evidence of these new particles have been found in 371 pb{sup -1} of CDF Run II data. New limits have been set which exclude gluino masses below 220 GeV and, in the region where M{sub {tilde g}} {approx} M{sub {tilde q}}, masses below 380 GeV/c{sup 2} are excluded. These limits are valid in a mSUGRA scenario with tan {beta} = 5, A = 0 and {mu} &l… more
Date: January 1, 2007
Creator: Portell i Bueso, Xavier
Partner: UNT Libraries Government Documents Department
open access

Neutrino Factory Targets and the MICE Beam

Description: The future of particle physics in the next 30 years must include detailed study of neutrinos. The first proof of physics beyond the Standard Model of particle physics is evident in results from recent neutrino experiments which imply that neutrinos have mass and flavour mixing. The Neutrino Factory is the leading contender to measure precisely the neutrino mixing parameters to probe beyond the Standard Model physics. Significantly, one must look to measure the mixing angle θ<sub>13</sub> and in… more
Date: January 1, 2007
Creator: Walaron, Kenneth Andrew
Partner: UNT Libraries Government Documents Department
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