5 Matching Results

Search Results

Results: 1 - 5
open access

Study of the top quark electric charge at the CDF experiment

Description: We report on the measurement of the top quark electric charge using the jet charge tagging method on events containing a single lepton collected by the CDF II detector at Fermilab between February 2002 and February 2010 at the center-of-mass energy {radical}s = 1.96 TeV. There are three main components to this measurement: determining the charge of the W (using the charge of the lepton), pairing the W with the b-jet to ensure that they are from the same top decay branch and finally determining … more
Date: September 1, 2011
Creator: Bartos, Pavol
Partner: UNT Libraries Government Documents Department
open access

Hard photo-disintegration of proton pairs in {sup 3}He nuclei

Description: Extensive studies of high-energy deuteron photodisintegration over the past two decades have probed the limits of meson-baryon descriptions of nuclei and nuclear reactions. At high energies, photodisintegration cross sections have been shown to scale as a power law in s (the total cm energy squared), which suggests that quarks are the relevant degrees of freedom. In an attempt to more clearly identify the underlying dynamics at play, JLab/Hall A experiment 03-101 measured the hard photodisinteg… more
Date: September 1, 2011
Creator: Pomerantz, Ishay
Partner: UNT Libraries Government Documents Department
open access

Search for Supersymmetry in the Dilepton Final State with Taus at CDF Run II

Description: This thesis presents the results a search for chargino and neutralino supersymmetric particles yielding same signed dilepton final states including one hadronically decaying tau lepton using 6.0 fb{sup -1} of data collected by the the CDF II detector. This signature is important in SUSY models where, at high tan {beta}, the branching ratio of charginos and neutralinos to tau leptons becomes dominant. We study event acceptance, lepton identification cuts, and efficiencies. We set limits on the p… more
Date: September 1, 2011
Creator: Forrest, Robert David
Partner: UNT Libraries Government Documents Department
open access

Quantifying Uranium Isotope Ratios Using Resonance Ionization Mass Spectrometry: The Influence of Laser Parameters on Relative Ionization Probability

Description: Resonance Ionization Mass Spectrometry (RIMS) has been developed as a method to measure relative uranium isotope abundances. In this approach, RIMS is used as an element-selective ionization process to provide a distinction between uranium atoms and potential isobars without the aid of chemical purification and separation. We explore the laser parameters critical to the ionization process and their effects on the measured isotope ratio. Specifically, the use of broad bandwidth lasers with autom… more
Date: September 6, 2011
Creator: Isselhardt, B H
Partner: UNT Libraries Government Documents Department
Back to Top of Screen