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Di-J/psi Studies, Level 3 Tracking and the D0 Run IIb Upgrade [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
209 pages : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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/ψ states using both Run IIa and Run IIb data. Improvements made to the tracking and vertexing algorithms during Run IIa included the optimization of the existing tracking software to reduce overall processing time and the certification and testing of a new software release. Upgrades made to the high level trigger for Run IIb included the development of a new tracking algorithm and the inclusion of the new Layer 0 silicon detector into the existing software. The integration of Layer 0 into the high level trigger has led to an improvement in the overall impact parameter resolution for tracks of ≈50%. The development of a new parameterization method for finding the error associated to the impact parameter of tracks returned by the high level tracking algorithm, in association with the inclusion of Layer 0, has led to improvements in vertex resolution of ≈4.5 {micro}m. A previous search in the di-J/ψ channel revealed a unpredicted resonance at ≈13.7 GeV/c². A confirmation analysis is presented using 2.8 fb⁻¹ of data and two different approaches to cuts. No significant excess is seen in the di-J/ψ mass spectrum.
Report Numbers
E 1.99:fermilab-thesis-2009-53
fermilab-thesis-2009-53
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Note
Published through SciTech Connect.
10/01/2009.
"fermilab-thesis-2009-53"
Vint, Philip John.
Funding Information
AC02-07CH11359
View MARC record | catkey: 14707165