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DTSTAMP:20261021T220832Z
LAST-MODIFIED:20140528T201840Z
DTSTART:20140619T180000Z
DTEND:20140619T190000Z
UID:event1294@bu.edu
URL:http://physics.bu.edu/internal/events/show/1294
SUMMARY:Standard Model and Exotic Physics with the Top Quark at ATLAS
DESCRIPTION:Featuring Clare Bernard\n\nPart of the PhD Final Oral Exams.\n\
	nExamining Committee:  Kevin Black\, John Butler\, Rob Carey\, Rama Bansil\
	, Ami Katz\n\nAbstract:\n\nThe top quark is the most massive fundamental pa
	rticle in the Standard Model of particle physics. Only experimentally obser
	ved in 1995\, it can be used as a precise test of Standard Model prediction
	s\, and it could lend insight to the problem of what lies beyond the Standa
	rd Model. This thesis presents a measurement of top-quark pair production u
	sing data collected at a center-of-mass energy of 7 TeV in 2011\, and a sea
	rch for production of vector-like quarks using data collected at 8 TeV in 2
	012. Both datasets were recorded by the ATLAS detector\, a multipurpose pro
	ton-proton collider located at the CERN LHC outside of Geneva Switzerland. 
	The top-quark pair production cross-section is measured as a function of fo
	ur different variables and the results are presented as normalized\, differ
	ential spectra. The variables considered are the transverse momentum of the
	 top quark\, and the mass\, rapidity\, and transverse momentum of the top-q
	uark pair system. Events are selected in the lepton+jets channel\, and the 
	measured spectra are corrected for detector resolution and efficiency. The 
	final results are compared with various predictions from Monte Carlo genera
	tors\, theoretical calculations and proton parton distribution functions an
	d found to be in reasonable agreement. Data is found to be softer than all 
	predictions\, particularly for high values of top-quark transverse momentum
	 and the top-quark pair invariant mass.\n\nThe search for vector-like quark
	s focuses on new heavy quarks that decay with\na large branching ratio to a
	 Z boson and a third generation Standard Model quark.\nEvents are selected 
	with at least two leptons (electrons and muons)\, and two of the\nleptons a
	re required to reconstruct a Z boson with high transverse momentum. No\nsig
	nificant excess of events is observed above the Standard Model prediction. 
	Upper\nlimits on the masses of vector-like T and B quarks are derived as a 
	function of the\nelectroweak coupling parameter\, and for various branching
	 ratio hypotheses.\n\n![Clare Bernard](/resources/event-image/1294/42c82ff_
	small)
LOCATION:PRB 365\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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