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Di-J/psi Studies, Level 3 Tracking and the D0 Run IIb Upgrade

Description: The D0 detector underwent an upgrade to its silicon vertex detector and triggering systems during the transition from Run IIa to Run IIb to maximize its ability to fully exploit Run II at the Fermilab Tevatron. This thesis describes improvements made to the tracking and vertexing algorithms used by the high level trigger in both Run IIa and Run IIb, as well as a search for resonant di-J/{psi} states using both Run IIa and Run IIb data. Improvements made to the tracking and vertexing algorithms … more
Date: October 1, 2009
Creator: Vint, Philip John
Partner: UNT Libraries Government Documents Department
open access

A search for muon neutrino to electron neutrino oscillations in the MINOS Experiment

Description: We perform a search for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations, a process which would manifest a nonzero value of the {theta}{sub 13} mixing angle, in the MINOS long-baseline neutrino oscillation experiment. The analysis consists of searching for an excess of {nu}{sub e} charged-current candidate events over the predicted backgrounds, made mostly of neutral-current events with high electromagnetic content. A novel technique to select electron neutrino events is developed, which achiev… more
Date: October 1, 2009
Creator: Ochoa Ricoux, Juan Pedro & /Caltech
Partner: UNT Libraries Government Documents Department
open access

Scalable Performance Measurement and Analysis

Description: Concurrency levels in large-scale, distributed-memory supercomputers are rising exponentially. Modern machines may contain 100,000 or more microprocessor cores, and the largest of these, IBM's Blue Gene/L, contains over 200,000 cores. Future systems are expected to support millions of concurrent tasks. In this dissertation, we focus on efficient techniques for measuring and analyzing the performance of applications running on very large parallel machines. Tuning the performance of large-scale a… more
Date: October 27, 2009
Creator: Gamblin, T
Partner: UNT Libraries Government Documents Department
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