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Permanent link (DOI): https://doi.org/10.7939/R31834C90

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

Descriptions

Other title
Subject/Keyword
Microscopic Black Holes
ATLAS Detector
Large Hadron Collider
8 TeV Proton-Proton Collisions
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Butt, Aatif I
Supervisor and department
Gingrich, Douglas (Department of Physics)
Examining committee member and department
Hallin, Aksel (Department of Physics)
Montigny, Marc (Department of Physics)
Kopper, Claudio (Department of Physics)
Hanna, David (McGill Physics Department)
Department
Department of Physics
Specialization

Date accepted
2016-09-21T11:09:03Z
Graduation date
2016-06:Fall 2016
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Higher dimensional microscopic black holes may be produced in particle accelerators at high energies which will emit a high multiplicity of Standard Model (SM) particles via thermal decay. This thesis documents a search for higher dimensional microscopic black holes in multi-jet final-states using six single-jet triggers with the ATLAS detector with 8 TeV proton-proton collisions at the Large Hadron Collider. The ATLAS 2012 data corresponds to a total integrated luminosity of 20.3~fb$^{-1}$. The background topology in this search consists of all multi-jet final-states from all SM processes. Quantum Chromodynamics (QCD) processes contribute maximally to the SM multi-jet final-states and dominate this background topology. The invariant mass (M) and scalar sum of transverse momenta of all jets (HT) in events are used as analysis variables. The M and HT distributions for ATLAS data are consistent with QCD predictions of two well known hadronization models (PYTHIA8 and HERWIG++) for each single-jet trigger. Counting experiments are performed to set model-independent upper limits (at 95% confidence level) on the production cross section times acceptance times efficiency of new physics in multi-jet events. The model-independent upper limit on the production cross section times acceptance times efficiency is 0.15 fb for the threshold mass M_{th}>4.5 TeV. Model-dependent production cross section limits (at 95% confidence level) are also calculated versus M_{th} and fundamental Planck mass M_{D} for non-rotating and rotating black holes for two, four and six large extra dimensions.
Language
English
DOI
doi:10.7939/R31834C90
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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