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Search for Lepton Flavour Violating Decays Tau -> l Ks with the BABAR Detector

Description: We present the search for the lepton flavour violating decay {tau} {yields} lK{sup 0}{sub s} with the BaBar experiment data. This process and many other lepton flavour violating {tau} decays, like {tau} {yields} {mu}{gamma} and {tau} {yields} lll, are one of the most promising channel to search for evidence of new physics. According to the Standard Model and the neutrino mixing parameters, branching fractions are estimated well below 10{sup -14}, but many models of new physics allow for branchi… more
Date: March 20, 2009
Creator: Cenci, Riccardo
Partner: UNT Libraries Government Documents Department
open access

Simulation free measurement of the B+ lifetime using decays selected using displaced tracks

Description: The lifetime of the B{sup {+-}} meson is measured using the decay channel B{sup +} {yields} {bar D}{sup 0}{pi}{sup +}. The measurement is made using approximately 1.0 fb{sup -1} of Tevatron proton-anti-proton collision data at {radical}s = 1.96 TeV collected by the CDF detector. The data were collected using impact parameter based triggers that were designed to select events with a secondary vertex. The trigger selection criteria result in data rich in a variety of B hadron decays, but intrinsi… more
Date: March 1, 2009
Creator: Malde, Sneha
Partner: UNT Libraries Government Documents Department
open access

The Development of the Electrically Controlled High Power RF Switch and Its Application to Active RF Pulse Compression Systems

Description: In the past decades, there has been increasing interest in pulsed high power RF sources for building high-gradient high-energy particle accelerators. Passive RF pulse compression systems have been used in many applications to match the available RF sources to the loads requiring higher RF power but a shorter pulse. Theoretically, an active RF pulse compression system has the advantage of higher efficiency and compactness over the passive system. However, the key component for such a system an e… more
Date: March 20, 2009
Creator: Guo, Jiquan
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Oscillation Frequency of B_s Mesons in the Hadronic Decay Mode B_s-> pi D_s(phi pi)X$ with the D0 Detector at the Fermilab Tevatron Collider

Description: The standard model (SM) of particle physics is a theory, describing three out of four fundamental forces. In this model the Cabibbo-Kobayashi-Maskawa (CKM) matrix describes the transformation between the mass and weak eigenstates of quarks. The matrix properties can be visualized as triangles in the complex plane. A precise measurement of all triangle parameters can be used to verify the validity of the SM. The least precisely measured parameter of the triangle is related to the CKM element |V{… more
Date: March 1, 2009
Creator: Weber, Gernot August & /Mainz U., Inst. Phys.
Partner: UNT Libraries Government Documents Department
open access

Neutrino and antineutrino inclusive charged-current cross section measurement with the MINOS near detector

Description: This thesis presents the measurement of energy dependence of the neutrino-nucleon inclusive charged current cross section on an isoscalar target in the range 3-50 GeV for neutrinos and 5-50 GeV energy range for antineutrinos. The data set was collected with the MINOS Near Detector using the wide band NuMI beam at Fermilab. The size of the charged current sample is 1.94 x 10{sup 6} neutrino events and 1.60 x 10{sup 5} antineutrino events. The flux has been extracted using a low hadronic energy s… more
Date: March 1, 2009
Creator: Bhattacharya, Debdatta & U., /Pittsburgh
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Single Top Quark Production Cross Section in 1.96-TeV Proton-Antiproton Collisions

Description: Top quarks are predominantly produced in pairs via the strong interaction in {bar p}p collisions at {radical}s = 1.96 TeV . The top quark has a weak isospin 1/2, composing a weak isospin doublet with the bottom quark. This characteristic predicts not only top quark pair production via strong interaction but also single production together with a bottom quark via weak interaction. However, finding single top quark production is challenging since it is rarely produced ({sigma}{sub singletop} = 2.… more
Date: March 1, 2009
Creator: Nakamura, Koji
Partner: UNT Libraries Government Documents Department
open access

A study of muon neutrino to electron neutrino oscillations in the MINOS experiment

Description: The observation of neutrino oscillations (neutrino changing from one flavor to another) has provided compelling evidence that the neutrinos have non-zero masses and that leptons mix, which is not part of the original Standard Model of particle physics. The theoretical framework that describes neutrino oscillation involves two mass scales ({Delta}m{sub atm}{sup 2} and {Delta}m{sub sol}{sup 2}), three mixing angles ({theta}{sub 12}, {theta}{sub 23}, and {theta}{sub 13}) and one CP violating phase… more
Date: March 1, 2009
Creator: Yang, Tingjun
Partner: UNT Libraries Government Documents Department
open access

First evidence for WW and WZ diboson production with semi-leptonic decays at a Hadron Collider

Description: Presented is a measurement of the simultaneous production of a W{sup {+-}} boson in association with a second weak boson (W{sup {+-}} or Z{sup 0}) in p{bar p} collisions at {radical}s = 1.96 TeV. Events are consider with one electron or one muon, missing transverse energy, and at least two hadronic jets. The data were collected by the D0 detector in Run IIa of the Tevatron accelerator and correspond to 1.07 fb{sup -1} of integrated luminosity for each of the two channels (WW/WZ {yields} e{nu}q{… more
Date: March 1, 2009
Creator: Haley, Joseph Glenn Biddle
Partner: UNT Libraries Government Documents Department
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