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DTSTAMP:20261014T063540Z
LAST-MODIFIED:20201002T134055Z
DTSTART:20201013T200000Z
DTEND:20201013T210000Z
UID:event2363@bu.edu
URL:http://physics.bu.edu/internal/events/show/2363
SUMMARY:Search for dark matter in the final state that contains a hadronica
	lly decayed W/Z boson and missing transverse energy 
DESCRIPTION:Featuring Siqi Yuan\, Boston University\, Physics Department\n\
	nPart of the Preliminary Oral Exam.\n\nThe rate of Higgs boson decays into 
	invisible particles is very low within the Standard Model\, but it could be
	 significantly enhanced in many beyond-standard-model scenarios where the H
	iggs boson decays into dark matter candidates. At the LHC\, the Higgs boson
	 can be produced in several channels including  the gluon fusion (ggH) chan
	nel\, the vector boson fusion (VBF) channel\, and in associated production 
	with a W/Z boson (VH channel). Although the VH channel has relatively small
	er cross-section compared to the ggH or VBF channel\, the hadronic decay si
	gnature of the W or Z boson in the VH channel can serve as a handle to redu
	ce the QCD background contributions\, making it very sensitive to the poten
	tial signal.\nIn this talk I will introduce a search for dark matter in the
	 final state that contains a hadronically decayed W/Z boson and missing tra
	nsverse energy. A data sample of proton-proton collisions at sqrt(s)=13 TeV
	 collected with the CMS detector at LHC in 2017 and 2018\,  corresponding t
	o an integrated luminosity of 101 fb-1\, is analyzed. A deep-learning based
	 tagger is used to identify the hadronically decayed W/Z against jets from 
	QCD radiation\, with a better performance than traditional taggers of the s
	ame purpose. Multiple control regions orthogonal to the signal region are d
	efined to estimate the leading background from a data-driven approach. This
	 analysis is found to be sensitive to the invisible Higgs branching fractio
	n as low as 40%.\n\nZoom Link for event: https://bostonu.zoom.us/j/96242128
	233?pwd=UHl3aWFLU2ViRFhmbXRDbWxSaG13QT09
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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