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SEQUENCE:2
UID:UW-Physics-Event-8988
DTSTART:20241125T223000Z
DTEND:20241126T000000Z
DTSTAMP:20260413T184630Z
LAST-MODIFIED:20241122T200924Z
LOCATION:5280 CH or https://cern.zoom.us/j/4914748834?pwd=L3ZDNTA3cmpT
 QnpweWF3ZzhNb3YwQT09#success
SUMMARY:Search for dark matter produced in association with top quarks
  at the Compact Muon Solenoid}\, Thesis Defense\, Victor Shang\, Physi
 cs PhD Graduate Student
DESCRIPTION:One of the fundamental open questions that cannot be curre
 ntly explained by the Standard Model is the particle nature of dark ma
 tter. Though astrophysical observations provide indirect evidence of i
 ts existence\, dark matter has not been directly measured so far. Howe
 ver\, under certain assumptions\, dark matter may be possible to produ
 ce and detect at high energy particle colliders like the LHC.<br>
\n<b
 r>
\nThis thesis presents a search for dark matter produced in associa
 tion with top quarks in data collected by the CMS detector at the LHC\
 , corresponding to 138 fb-1 of proton-proton collisions at a center-of
 -mass energy of 13 TeV. Production of dark matter particles in associa
 tion with both a single top quark and a pair of top quarks are conside
 red. The search is performed in three separate channels depending on t
 he number of leptons in the final state\, which include the all hadron
 ic\, single lepton\, and dileptonic final states. The primary strategy
  of the search is to look for an excess of events with respect to the 
 background-only prediction in events with a large imbalance in the tra
 nsverse momentum. The results are interpreted in the context of a simp
 lified model in which either a scalar or pseudoscalar mediator couples
  to top quarks and to dark matter fermions. Future prospects for impro
 ving the search are also discussed
URL:https://www.physics.wisc.edu/events/?id=8988
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