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Search for Microscopic Black Holes in Multijet Final States with the ATLAS Detector using 8 TeV Proton-Proton Collisions at the Large Hadron Collider Open Access


Other title
Microscopic Black Holes, ATLAS, LHC
Type of item
Degree grantor
University of Alberta
Author or creator
Saddique, Asif
Supervisor and department
Douglas Gingrich
Examining committee member and department
Scott Menary (Department of Physics)
Darren Grant (Department of Physics)
Roger Moore (Department of Physics)
Douglas Gingrich (Department of Physics)
Don Page (Department of Physics)
Department of Physics

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Microscopic black holes are expected to produce a high multiplicity of Standard Model (SM) particles having large transverse momenta in the final state. In this thesis, a search for microscopic black holes in multijet final states with the ATLAS 2012 data using 8~TeV centre of mass energy of proton-proton collisions at the Large Hadron Collider is performed in a data sample corresponding to an integrated luminosity of $20.3$ fb$^{-1}$. The search is simplified to multijet final states because most of the expected SM particles produced from black hole decay would lead to hadronic jets. The data events with high-transverse momenta have been analysed for different exclusive jet multiplicities, i.e. $2,3,...,7$, and inclusive jet multiplicities, i.e. $\geq 3,4,...,7$. In this multijet analysis, Quantum Chromodynamics (QCD) multijet production is the main background. For all the multijet final states, the data distributions for the sum of jet transverse momenta ($H_{T}=\sum p_{T}$) in an event have been observed to be consistent with QCD expectations. For inclusive multijet final states, model-independent and model-dependent exclusion limits at a 95$\%$ confidence level are set on the production of new physics and non-rotating black holes, respectively. The model-independent upper limit on cross section times acceptance times efficiency is 0.29 fb to 0.14 fb for jet multiplicities $\geq3$ to $\geq7$ for $H_{T}>4.0$ TeV. The model-dependent lower limits on minimum black hole mass are set for different non-rotating black hole models.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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