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DTSTAMP:20261021T134807Z
LAST-MODIFIED:20140320T145111Z
DTSTART:20140401T150000Z
DTEND:20140401T160000Z
UID:event1259@bu.edu
URL:http://physics.bu.edu/internal/events/show/1259
SUMMARY:A Search for a Heavy Resonance Decaying to a Top Quark and A bottom
	 Quark with the CMS Experiment
DESCRIPTION:Featuring David Sperka\n\nPart of the PhD Final Oral Exams.\n\n
	Examining Committee:  Tulika Bose\, John M. Butler\, James W. Rohlf\, Kenne
	th Lane\, Shyamsunder Erramilli\n\nABSTRACT\n\nThe standard model of partic
	le physics can explain most measurements of particle properties and interac
	tions performed to date. However\, it does not naturally explain the relati
	vely light Higgs boson mass or the existence of small neutrino masses\, and
	 has no explanation for the dark matter observed in the universe. Many exte
	nsions to the standard model have been proposed to attempt to address these
	 questions\, and several predict the existence of heavy charged gauge boson
	s\, usually referred to as W' bosons. The Large Hadron Collider at CERN is 
	the largest and most powerful particle accelerator in the world and offers 
	the opportunity to search for W' bosons using the CMS experiment\, a large 
	multi-purpose particle detector.\n\nResults are presented from a search for
	 a W' boson produced in proton-proton collisions at a center of mass energy
	 sqrt(s)=8 TeV and decaying into a top and a bottom quark\, using a dataset
	 collected by the CMS experiment corresponding to an integrated luminosity 
	of 19.5 fb-1.  Various models of W'-boson production are studied by allowin
	g for an arbitrary combination of left- and right-handed fermionic coupling
	s. The analysis is based on the detection of events with an electron or muo
	n\, jets and missing transverse energy in the final state.  No evidence for
	 W'-boson production is found and 95% confidence level upper limits are obt
	ained on the production cross section for several mass hypotheses and compa
	red to theoretical predictions. For W' bosons with purely right-handed coup
	lings\, and for those with left-handed couplings when ignoring interference
	 effects\, the observed 95% confidence level limit on the W' boson mass is 
	M(W')>2.05 TeV. These are the most stringent limits obtained to date in thi
	s channel.\n\n\n![Sperka](/resources/event-image/1259/5ed3a82_small)
LOCATION:PRB 365\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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