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DTSTAMP:20261019T054201Z
LAST-MODIFIED:20161130T015659Z
DTSTART:20161201T153000Z
DTEND:20161201T163000Z
UID:event1688@bu.edu
URL:http://physics.bu.edu/internal/events/show/1688
SUMMARY:Searches for New Physics with Boosted Top Quarks and the CMS Forwar
	d Pixel Detector Phase 1 Upgrade Mechanics
DESCRIPTION:Featuring Maral Alyari\, SUNY Buffalo\nHosted by: Kevin Black\n
	\nPart of the HEE Seminar Series.\n\nMany "beyond the Standard Model" (BSM)
	 models introduced to solve the hierarchy problem\ninvolve quantum interact
	ions with top quarks to mitigate the increase in mass of the Higgs\nboson. 
	Hence\, new physics signatures involving the Top quark are good candidates 
	for this\npuzzle. We search for new physics at the LHC with the CMS detecto
	r in the form of a massive\nparticle decaying to a pair of top quarks. For 
	large masses\, these top quarks will be highly\nboosted\, leading to unique
	 event topologies with merged top decay products. We utilize jet\nsubstruct
	ure and subjet b-tagging techniques to identify these events\, and proceed 
	to set limits\non the possible cross sections of new physics models. Curren
	tly LHC runs at the luminosity of\n34 cm-2s-1. In 2017 the luminosity of th
	e LHC will also be upgraded to 2E34 cm-2s-1\, providing\nphysicists a great
	er opportunity to seek answers to some of the particle physics mysteries we
	\nhave encountered since the inception of the LHC. A new pixel detector for
	 the CMS experiment\nis currently under construction\, to be installed duri
	ng the extended year end shutdown 2017.\nThe pixel detector\, the core of t
	he CMS detector\, was commissioned in 2008 and is so far\nrunning successfu
	lly. However the higher instantaneous luminosity will cause unacceptable\nd
	ynamic inefficiencies due to buffer overflows. The more complex track patte
	rn recognition due\nto higher pileup will require an additional pixel detec
	tor layer to maintain good efficiency. The\nPhase 1 pixel detector replacem
	ent addresses these shortcomings. To add an additional\ndetector layer with
	out adding material required a complete redesign of the mechanical support\
	nand cooling using novel materials.
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STATUS:TENTATIVE
CLASS:PUBLIC
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