A Search for Neutral Supersymmetric Higgs Bosons at D0

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A search for Higgs bosons in multijet data from the D0 detector is reported in this thesis. The Higgs boson is the only remaining undiscovered particle in the Standard Model of particle physics, and plays an integral role in this model. It is known that this model is not a complete description of fundamental physics (it does not describe gravity, for example), and so searches for physics beyond the Standard Model are an important part of particle physics. One extension of the Standard Model, the Minimal Supersymmetric Standard Model (MSSM), predicts the existence of five Higgs bosons, two of which ... continued below

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129 pages

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Osman, Nicolas Ahmed & /Imperial Coll., London September 1, 2010.

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Description

A search for Higgs bosons in multijet data from the D0 detector is reported in this thesis. The Higgs boson is the only remaining undiscovered particle in the Standard Model of particle physics, and plays an integral role in this model. It is known that this model is not a complete description of fundamental physics (it does not describe gravity, for example), and so searches for physics beyond the Standard Model are an important part of particle physics. One extension of the Standard Model, the Minimal Supersymmetric Standard Model (MSSM), predicts the existence of five Higgs bosons, two of which can show an enhanced coupling to bottom quarks. For this reason, a search in the bbb (multijet) channel is a sensitive test of Higgs boson physics. The analysis described in this thesis was conducted over 6.6 fb{sup -1} of data. At the time of writing, the best limits on tan {beta} (a key parameter of the MSSM) in the multijet channel were set by D0. The new analysis described in this thesis included more data than the previous analysis in the channel, and made use of a new trigger and event-based analysis method. An improved Multivariate Analysis technique was used to separate signal and background events and produce a final discriminant for the limit setting process. These changes increased the expected sensitivity of this measurement by roughly 50% more than would be expected from the increase in the size of data sample alone.

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129 pages

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  • Report No.: FERMILAB-THESIS-2010-67
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/1018736 | External Link
  • Office of Scientific & Technical Information Report Number: 1018736
  • Archival Resource Key: ark:/67531/metadc846155

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 1, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Aug. 29, 2016, 3:35 p.m.

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Osman, Nicolas Ahmed & /Imperial Coll., London. A Search for Neutral Supersymmetric Higgs Bosons at D0, thesis or dissertation, September 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc846155/: accessed November 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.