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open access

A Search for New Physics with High Mass Tau Pairs in proton anti-proton collisions at s**(1/2) = 1.96-TeV at CDF

Description: We present the results of a search for new particles decaying to tau pairs using the data corresponding to an integrated luminosity of 195 pb{sup -1} collected from March 2002 to September 2003 with the CDF detector at the Tevatron. Hypothetical particles, such as Z' and MSSM Higgs bosons can potentially produce the tau pair final state. We discuss the method of tau identification, and show the signal acceptance versus new particle mass. The low-mass region, dominated by Z {yields} {tau}{tau}, … more
Date: April 1, 2005
Creator: Wan, Zong-ru
Partner: UNT Libraries Government Documents Department
open access

Character and Effective Leadership of the Knowledge Worker

Description: Ulrich in the forward to the Zenger and Folkman (2002) book, ''The Extraordinary Leader'', wrote about the importance of character in leadership stating, ''Everything about great leaders radiates from character. Character improves the probability of exhibiting strong interpersonal skill. Some of this perceived character is innate . . . but more is driven by the leader's self-awareness and interactions with others'' (p. ix). The purpose of this study was to explore the relationship between leade… more
Date: April 20, 2005
Creator: Khoury, A E
Partner: UNT Libraries Government Documents Department
open access

Top quark pair production in proton anti-proton collisions

Description: This thesis presents a measurement of the t{bar t} cross section in the all-jets channel, measured in p{bar p} collisions at a center of mass energy of 1.96 TeV, using data collected with the D0 detector. The dataset used for this analysis has an integrated luminosity equivalent to L = 162.5 {+-} 10.6 pb{sup -1}. A t{bar t} cross section measurement is a test of the Standard Model predictions for heavy quark production, and the first step towards measurements of the mass and other properties of… more
Date: April 1, 2005
Creator: Blekman, Freya & /NIKHEF, Amsterdam
Partner: UNT Libraries Government Documents Department
open access

Spin distribution in preequilibrium reactions for 48Ti + n.

Description: Cross section measurements were made of prompt {gamma}-ray production as a function of incident neutron energy on a {sup 48}Ti sample. Partial {gamma}-ray cross sections for transitions in {sup 45-48}Ti, {sup 44-48}Sc, and {sup 42-45}Ca have been determined. Energetic neutrons were delivered by the Los Alamos National Laboratory spallation neutron source located at the LANSCE/WNR facility. The prompt-reaction {gamma} rays were detected with the large-scale Compton-suppressed germanium array for… more
Date: April 6, 2005
Creator: Dashdorj, D
Partner: UNT Libraries Government Documents Department
open access

The inclusive jet cross-section in proton anti-proton collisions at s**(1/2) = 1.96-TeV using the MidPoint jet algorithm

Description: The following work presents a preliminary measurement of the inclusive jet cross section for jet transverse momenta from 61 to 620 GeV in the rapidity range 0.1 < |Y| < 0.7. The result is based on 218 pb{sup -1} of data collected by the CDF detector at the Fermi National Accelerator Lab. The data are consistent with NLO pQCD predictions based on the CTEQ6.1 parton distribution functions.
Date: April 1, 2005
Creator: Flanagan, Gene U.
Partner: UNT Libraries Government Documents Department
open access

A Measurement of the Helicity of W Bosons Produced in Top-Quark Decays

Description: We have measured the fraction of longitudinally polarized W bosons produced top-quark decays. The result of the analysis in single-lepton t{bar t} events is fully consistent with the Standard Model expectation. The 2{sigma} discrepancy in the dilepton analysis is suggestive of new phenomena. However, given the significance of the discrepancy, any claim of new physics based on this analysis is highly speculative. It is worth noting that another analysis of the kinematic properties of these data … more
Date: April 1, 2005
Creator: Goldschmidt, Nathan Joel
Partner: UNT Libraries Government Documents Department
open access

Measurement of top anti-top cross section in proton - anti-proton collider at s**(1/2) = 1.96-TeV

Description: Discovery of the top quark in 1995 at the Fermilab Tevatron collider concluded a long search following the 1977 discovery of bottom (b) quark [1] and represents another triumph of the Standard Model (SM) of elementary particles. Top quark is one of the fundamental fermions in the Standard Model of electroweak interactions and is the weak-isospin partner of the bottom quark. A precise measurement of top pair production cross-section would be a test of Quantum Chromodynamics (QCD) prediction. Pre… more
Date: April 1, 2005
Creator: Mal, Prolay Kumar & Inst., /Tata
Partner: UNT Libraries Government Documents Department
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