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BEGIN:VEVENT
DTSTAMP:20261023T233950Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20111114T150000Z
DTEND:20111114T160000Z
UID:event230@bu.edu
URL:http://physics.bu.edu/internal/events/show/230
SUMMARY:A Search for Technicolor at the Large Hadron Collider
DESCRIPTION:Featuring Jeremy Love\n\nPart of the PhD Final Oral Exams.\n\nD
	issertation Committee:  John Butler\, Kevin Black\, Robert Carey (Chai
	rman)\, Kenneth Lane and William Skocpol\nAbstract:\nThe Standard Model of 
	particle physics provides an accurate description of all experimental data 
	to date. The only unobserved piece of the Standard Model is the Higgs boson
	\, a consequence of the spontaneous breaking of electroweak symmetry by the
	 Higgs mechanism. An alternative to the Higgs mechanism is proposed by Tech
	nicolor theories which break electroweak symmetry dynamically through a new
	 force. Technicolor predicts many new particles\, called Technihadrons\, th
	at could be observed by experiments at hadron colliders. This thesis presen
	ts a search for two of the lightest Technihadrons\, the ρT and ωT
	.\nThe Low-Scale Technicolor model predicts the phenomenology of these new 
	states. The ρT and ωT are produced through quark anti-quark annih
	ilation and couple to Standard Model fermions through the Drell-Yan process
	\, which can result in the dimuon final state. The ρT and ωT pref
	erentially decay to the πT and a Standard Model gauge boson if kinematic
	ally allowed. Changing the mass of the πT relative to that of the ρT
	 and ωT affects the cross section times branching fraction to dimuons
	. The ρT and ωT are expected to have masses below about 1 TeV.\nT
	he Large Hadron Collider (LHC) at CERN outside of Geneva\, Switzerland\, pr
	oduces proton-proton collisions with a center of mass energy of 7 TeV. A ge
	neral purpose high energy physics detector ATLAS has been used in this anal
	ysis to search for Technihadrons decaying to two muons. We use the ATLAS de
	tector to reconstruct the tracks of muons with high transverse momentum com
	ing from these proton-proton collisions.\nThe dimuon invariant mass spectru
	m is analyzed above 130 GeV to test the consistency of the observed data wi
	th the Standard Model prediction. We observe excellent agreement between ou
	r data and the background only hypothesis\, and proceed to set limits on th
	e cross section times branching ratio of the ρT and ωT as a funct
	ion of their mass using the Low-Scale Technicolor model. We combine the die
	lectron and dimuon channels to exclude masses of the ρT and ωT be
	tween       130 GeV – 480 GeV at 95% Co
	nfidence Level for masses of the πT between 50 GeV – 480 GeV. In a
	ddition for the parameter choice of  m(πT) = m(ρT/ωT) &nd
	ash; 100 GeV\, 95% Confidence Level limits are set excluding masses of the 
	ρT and ωT below      470 GeV. This analy
	sis represents the current world's best limit on this model.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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