This thesis presents the detailed measurements of the tracking efficiency of the BaBar detector using T pair events. These efficiency measurements are critical for many physics analyses at BaBar. The tracking efficiency is dctcrmined both as a global valuc for the detector and in terms of the parameters on which the BaBar tracking reconstruction software depends. In addition, the charge asymmetry of the tracking efficiency as well as a detailed analysis of the systematic uncertainties related to this method are also presented. It was discovered that the sample of data conventionally used by BaBar for measuring the efficiency is contaminated by background and a ncw protocol for measuring thc cfficicncies is presented. Undcr this new protocol, the global tracking efficiency correction factor and the global tracking efficiency charge asymmetry are determined to be consistent with zero. A new method for determining the efficiency as a function of the reconstruction parameters, was also successfully demonstrated.

No description available.

Thesis (Ph. D.)--Rutgers University, 2009. / "Graduate Program in Physics and Astronomy." Includes bibliographical references (p. 173-185).

Thesis (M.Sc.). / Written for the Dept. of Physics. Title from title page of PDF (viewed 2008/12/04). Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (p. [69]-72).

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (p. 99-116).

Thesis (Ph. D.)--University of Oregon, 2005. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 219-223). Also available for download via the World Wide Web; free to University of Oregon users.

Thesis presented in fulfilment of the requirements for the degree of Master of Science in Physics at the University of the Witwatersrand School of Physics, University of the Witwatersrand, 2015. / A search for the pseudoscalar A boson, which is predicted by in many models with an extended Higgs sector, gives a gateway to searches for physics beyond the Standard Model (SM). This thesis presents the results of a search for gluon-fusion produced A in the decay to Zh, with a final state of two electrons or muons and two τ leptons, in 20.3 fb−1of proton-proton collision data at √s = 8 TeV. Each tau lepton is allowed to dacay either leptonically, τlep, or hadronically,τhad, giving rise to three final states, τlepτlep, τlepτhad and τhadτhad. Focus is placed on the methodology and results of the fully hadronic channel. No evidence for the existence of an A boson is found in the scanned range of 220 ≤ mA ≤ 1000 GeV and 95% CL upper limits are placed on the gluon-fusion cross section times branching ratio, σ × BR(A → Zh) × BR(h → ℓℓττ). The results are combined with a complementing A → Zh search, where h → b¯b, and interpreted in view of two-Higgs-Doublet-Models (2HDMs), where exclusion limits are placed on large sections of phasepace.

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No description available.