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Measurement of spin correlations in tt-bar systems in the muon+jets channel using a matrix element method with the CMS detector at the LHC

Kelly Beernaert (2015)
abstract
In this work, the consistency of the spin correlation strength in top quark pair events with the Standard Model (SM) prediction is tested in the muon+jets final state. The events are obtained from pp collisions at a centre-of-mass energy of sqrt(s) = 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(-1). Using a Matrix Element Method, event likelihoods are calculated under two different top quark pair hypotheses: the SM hypothesis and a hypothesis which predicts zero spin correlation. Using the event likelihoods, a variable sensitive to the spin correlation strength is constructed. In a hypothesis testing procedure, the data are found to favour the SM hypothesis. Using a template fit method, the fraction of events that show SM spin correlations is measured to be f = 0.72 +/- 0.08 (stat) +0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton+jets channel to date.
Please use this url to cite or link to this publication:
author
promoter
, UGent and
organization
year
type
dissertation
publication status
published
subject
keyword
CERN, top quark physics, particle physics, CMS, matrix element method
pages
X, 292 pages
publisher
Ghent University. Faculty of Sciences
place of publication
Ghent, Belgium
defense location
Gent : Campus Sterre (S9, aud. A2)
defense date
2015-09-10 14:30
project
CMS
language
English
UGent publication?
yes
classification
D1
copyright statement
I have retained and own the full copyright for this publication
id
6929793
handle
http://hdl.handle.net/1854/LU-6929793
date created
2015-09-14 15:21:26
date last changed
2017-05-29 11:36:51
@phdthesis{6929793,
  abstract     = {In this work, the consistency of the spin correlation strength in top quark pair events with the Standard Model (SM) prediction is tested in the muon+jets final state. The events are obtained from pp collisions at a centre-of-mass energy of sqrt(s) = 8 TeV, corresponding to an integrated luminosity of 19.7 fb\^{ }(-1). Using a Matrix Element Method, event likelihoods are calculated under two different top quark pair hypotheses: the SM hypothesis and a hypothesis which predicts zero spin correlation. Using the event likelihoods, a variable sensitive to the spin correlation strength is constructed. In a hypothesis testing procedure, the data are found to favour the SM hypothesis. Using a template fit method, the fraction of events that show SM spin correlations is measured to be f = 0.72 +/- 0.08 (stat) +0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton+jets channel to date.},
  author       = {Beernaert, Kelly},
  keyword      = {CERN,top quark physics,particle physics,CMS,matrix element method},
  language     = {eng},
  pages        = {X, 292},
  publisher    = {Ghent University. Faculty of Sciences},
  school       = {Ghent University},
  title        = {Measurement of spin correlations in tt-bar systems in the muon+jets channel using a matrix element method with the CMS detector at the LHC},
  year         = {2015},
}

Chicago
Beernaert, Kelly. 2015. “Measurement of Spin Correlations in Tt-bar Systems in the Muon+jets Channel Using a Matrix Element Method with the CMS Detector at the LHC”. Ghent, Belgium: Ghent University. Faculty of Sciences.
APA
Beernaert, Kelly. (2015). Measurement of spin correlations in tt-bar systems in the muon+jets channel using a matrix element method with the CMS detector at the LHC. Ghent University. Faculty of Sciences, Ghent, Belgium.
Vancouver
1.
Beernaert K. Measurement of spin correlations in tt-bar systems in the muon+jets channel using a matrix element method with the CMS detector at the LHC. [Ghent, Belgium]: Ghent University. Faculty of Sciences; 2015.
MLA
Beernaert, Kelly. “Measurement of Spin Correlations in Tt-bar Systems in the Muon+jets Channel Using a Matrix Element Method with the CMS Detector at the LHC.” 2015 : n. pag. Print.