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open access

A neural jet charge tagger for the measurement of the B/s0 anti-B/s0 oscillation frequency at CDF

Description: A Jet Charge Tagger algorithm for b-flavour tagging for the measurement of {Delta}m{sub s} at CDF has been presented. The tagger is based on a b-track probability variable and a b-jet probability variable, both obtained by combining the information available in b{bar b} events with a Neural Network. The tagging power measured on data is 0.917 {+-} 0.031% e+SVT sample; 0.938 {+-} 0.029% {mu}+SVT sample which is {approx}30% larger than the cut based Jet Charge Tagger employed for the B{sub s}{sup… more
Date: July 1, 2005
Creator: Lecci, Claudia
Partner: UNT Libraries Government Documents Department
open access

First observation of dijet events with an antiproton tag at s**(1/2) = 1.96 TeV using the D0 Forward Proton Detector

Description: The Forward Proton Detector (FPD) is a new sub-system of the D0 detector, a 5000 ton particle physics detector located at the Fermilab Tevatron proton-antiproton collider. The FPD was implemented for the Tevatron Run II and gives access to a wide range of diffractive scattering processes, where one or both of the beam particles remain intact. The analysis described in this thesis makes use of the dipole spectrometer of the FPD to tag outgoing antiprotons in events that have a dijet signature in… more
Date: July 1, 2005
Creator: Strang, Michael Allen
Partner: UNT Libraries Government Documents Department
open access

Determination of Delta m(d) and absolute calibration of flavor taggers for the Delta m(s) analysis, in fully reconstructed decays at the CDF experiment

Description: The new trigger processor, the Silicon Vertex Tracking (SVT), has dramatically improved the B physics capabilities of the upgraded CDF II Detector; for the first time in a hadron collider, the SVT has enabled the access to non-lepton-triggered B meson decays. Within the new available range of decay modes, the B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +} signature is of paramount importance in the measurement of the {Delta}m{sub s} mixing frequency. The analysis reported here is a step to… more
Date: July 1, 2005
Creator: Piedra, Jonatan & /Cantabria U., Santander
Partner: UNT Libraries Government Documents Department
open access

Search for supersymetric particles desintegrant itself in R-parite violee (coupling lambda_121) in a final state has three leptons

Description: This thesis is dedicated to the study of the first data taken by the D0 detector during the Run II of the Tevatron. Supersymmetric particles have been search for in proton-antiproton collisions, with a center of mass energy of 1.96 TeV. In the framework of supersymmetry with R-parity violation, I have studied the pair production of Gauginos, leading to a pair of LSP ({chi}{sub 1}{sup 0}), each one decaying into ee{nu}{sub {mu}} or e{mu}{nu}{sub e} with a {lambda}{sub 121} coupling. The final st… more
Date: July 1, 2005
Creator: Magnan, Anne-Marie & /LPSC, Grenoble
Partner: UNT Libraries Government Documents Department
open access

The Charge asymmetry in W bosons produced in p anti-p collisions at center of mass energy - 1.96 TeV

Description: The primary mode of production of W{sup +} bosons in a p{bar p} collider is u + {bar d} {yields} W{sup +}. The u quark generally carries more momentum than the {bar d} and the resultant W{sup +} tends to be boosted in the proton direction. Similarly, W bosons are boosted in the anti-proton direction. This is observed as an asymmetry in the rapidity distributions of positive and negative W bosons. Measurement of this asymmetry serves as a probe of the momentum distribution of partons within the … more
Date: July 1, 2005
Creator: Torborg, Julie M. & U., /Notre Dame
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Z/Gamma* (--> e+e-) + >=n Jet Production Cross Sections

Description: A study of events with Z={gamma}* bosons and hadronic jets produced at the Tevatron in p{bar p} collisions at a center of mass energy of 1.96 TeV is presented. The data consist of approximately 14,000 Z/{gamma}* {yields} e{sup +}e{sup -} decay candidates from 343 pb{sup -1} of integrated luminosity collected with the D0 detector. Cross sections and jet production properties have been measured for Z/{gamma}* + {ge} 0 to 5 jet events. This measurement represents a significant improvement over pre… more
Date: July 1, 2005
Creator: Buehler, Marc
Partner: UNT Libraries Government Documents Department
open access

An Investigation of the Neutral Cascade Muon Semileptonic Decay and its Observation at KTeV, Fermilab

Description: The authors report an investigation of the semileptonic decay {Xi}{sup 0} {yields} {sigma}{sup +} {mu}{sup -}{bar {nu}}{sub {mu}}. This decay was observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the {Xi}{sup 0} beta decay mode and yields a value for the ratio of decay rates {Lambda}({Xi}{sup 0} {yields} {Sigma}{sup +} {mu}{sup -}{bar {nu}}{sub {mu}})/{Lambda}({Xi}{sup 0} {yields} {Sigma}{sup +}e{sup -}{bar {nu}… more
Date: July 1, 2005
Creator: Gomes, Ricardo Avelino & U., /Campinas State
Partner: UNT Libraries Government Documents Department
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