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Plasma ion sources and ion beam technology inmicrofabrications

Description: For over decades, focused ion beam (FIB) has been playing a very important role in microscale technology and research, among which, semiconductor microfabrication is one of its biggest application area. As the dimensions of IC devices are scaled down, it has shown the need for new ion beam tools and new approaches to the fabrication of small-scale devices. In the meanwhile, nanotechnology has also deeply involved in material science research and bioresearch in recent years. The conventional FIB… more
Date: September 1, 2007
Creator: Ji, Lili
Partner: UNT Libraries Government Documents Department
open access

Observation of Bs-Bsbar Oscillations Using Partially Reconstructed Hadronic Bs Decays

Description: This thesis describes the contribution of partially reconstructed hadronic decays in the world's first observation of B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillations. The analysis is a core member of a suite of closely related studies whose combined time-dependent measurement of the B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillation frequency {Delta}m{sub s} is of historic significance. Using a data sample of 1 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected with the CDF-… more
Date: September 1, 2007
Creator: Miles, Jeffrey Robert
Partner: UNT Libraries Government Documents Department
open access

Search for supersymmetric partner of bottom quark at d0 at Tevatron. Studies on missing transverse energy

Description: Supersymmetry, extension of the Standard Model of Particle Physics (SM), is searched for by trying to observe the supersymmetric partner of bottom quark ({tilde b}). This search is performed using events with a final state comprising two acoplanar b-quark jets and missing transverse energy (MET) and coming from a sample of 992 pb{sup -1} of data collected by the D0 detector at the Tevatron, the Fermilab p{bar p} collider. The absence of an excess of events in comparison to MS expectations leads… more
Date: September 1, 2007
Creator: Calvet, Samuel Pierre
Partner: UNT Libraries Government Documents Department
open access

A Measurement of the Top Quark Mass in 1.96 TeV Proton-Antiproton Collisions Using a Novel Matrix Element Method

Description: A measurement of the top quark mass in t{bar t} {yields} l + jets candidate events, obtained from p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector, is presented. The measurement approach is that of a matrix element method. For each candidate event, a two dimensional likelihood is calculated in the top pole mass and a constant scale factor, 'JES', where JES multiplies the input particle jet momenta and is designed to account for the systematic uncer… more
Date: September 30, 2007
Creator: CDF Collaboration
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Neutron electric form factor at Q2=0.8 2(GeV\\c)

Description: Nucleon form factors allow a sensitive test for models of the nucleon. Recent experiments utilising polarisation observables have resulted, for the first time, in a model-independent determination of the neutron electric form factor GnE. This method employed an 80% longitudinally polarised, high intensity (10 uA) electon beam (883 MeV) that was quasi-elastically scattered off a liquid deuterium target in the reaction D (e, en)p. A neutron polarimeter was designed and installed to measure the ra… more
Date: September 30, 2007
Creator: Glazier, Derek
Partner: UNT Libraries Government Documents Department
open access

An optimised oscillation analysis of MINOS beam data

Description: This thesis presents results of the MINOS long baseline neutrino oscillation experiment. Charged Current interactions of {nu}{sub {mu}} from the NuMI beamline have been recorded in both the Near and Far Detectors between May 2005 and February 2006, corresponding to 1.27 x 10{sup 20} protons being delivered to the NuMI target. Several techniques for improving the sensitivity of an oscillation measurement are discussed and their impact assessed. 378 events are observed in the Far Detector during … more
Date: September 1, 2007
Creator: Culling, Andrew John & U., /Cambridge
Partner: UNT Libraries Government Documents Department
open access

Search for Rare Multi-Pion Decays of the Tau Lepton Using the BABAR Detector

Description: A search for the decay of the {tau} lepton to rare multi-pion final states is performed using the BABAR detector at the PEP-II asymmetric-energy e+e- collider. The analysis uses 232 fb-1 of data at center-of-mass energies on or near the {Upsilon}(4S) resonance. In the search for the {tau}- {yields} 3{pi}-2{pi}+2{pi}{sup 0}{nu}{sub {tau}} decay, we observe 10 events with an expected background of 6.5{sup +2.0}{sub -1.4} events. In the absence of a signal, we calculate the decay branching ratio u… more
Date: September 18, 2007
Creator: Ter-Antonyan, Ruben
Partner: UNT Libraries Government Documents Department
open access

Atmospheric neutrino observations in the MINOS far detector

Description: This thesis presents the results of atmospheric neutrino observations from a 12.23 ktyr exposure of the 5.42 kt MINOS Far Detector between 1st August 2003 until 1st March 2006. The separation of atmospheric neutrino events from the large background of cosmic muon events is discussed. A total of 277 candidate contained vertex {nu}/{bar {nu}}{sub {mu}} CC data events are observed, with an expectation of 354.4{+-}47.4 events in the absence of neutrino oscillations. A total of 182 events have clear… more
Date: September 1, 2007
Creator: Chapman, John Derek & U., /Cambridge
Partner: UNT Libraries Government Documents Department
open access

Study of B0 to D(*)0h0 Decay and Measurement ofsin(2beta)

Description: This thesis describes a measurement of a CP violating asymmetry in neutral B meson decays, B{sup 0} yields D{sup *0}h{sup 0}, where D{sup *0} is a charmed meson and h{sup 0} is a light meson, performed on data collected by the BABAR experiment at the SLAC asymmetric-energy electron-positron collider PEP-II.
Date: September 18, 2007
Creator: Bomben, Marco & /SLAC /Trieste U., DMI
Partner: UNT Libraries Government Documents Department
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