Evidence for a Higgs boson in tau decays with the CMS detector
Name
893437632-MIT.pdf
Description
Full printable version
Size
21.25 MB
Format
Adobe PDF
Checksum (MD5)
ce2ab88551709d47b0209ce2842554cc
Author(s)
Dutta, Valentina
Advisor(s)
Markus Klute.
Date Issued
2014
Publisher
Massachusetts Institute of Technology
Abstract
In this thesis, I describe the search for a Higgs boson through its decay to a pair of tan leptons with the tau-pair subsequently decaying to ail electron, a muon, and neutrinos. The search is performed using data collected from proton-proton collisions by the Compact Muon Solenoid experiment at the Large Hadron Collider, corresponding to 5.0 fb-1 of integrated luminosity recorded at a center-of-mass energy of 7 TeV and 19.7 fb-1 at 8 TeV. The expected significance for a Standard Model Higgs boson signal with a mass of 125 GeV is at the level of 1.2 standard deviations for the electron muon tau-pair decay mode. A mild excess of events is seen above the SM background expectation in this decay mode, consistent with a SM Higgs boson of mass 125 GeV. In combination with results using other tau-pair decay modes, an excess of events above the background expectation is seen at the level of 3.4 standard deviations. This constitutes the first evidence for a Higgs boson to decay to leptons. This thesis also describes an analysis of the data in the context of physics beyond the Standard Model, particularly in the framework of its Minimal Supersymnnetric extension.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2014.
120
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 175-185).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
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