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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-9632
DTSTART:20260420T180000Z
DTEND:20260420T200000Z
DTSTAMP:20260513T164655Z
LAST-MODIFIED:20260420T152708Z
LOCATION:Chamberlin 3290 (NOTE UPDATED LOCATION)
SUMMARY:A search for dark matter recoiling from the standard model Hig
 gs boson using the CMS experiment\, Graduate Program Event\, Shivani L
 omte
DESCRIPTION:Astrophysical evidence supports the existence of dark matt
 er based on its gravitational interaction. Astrophysical evidence also
  points to that dark matter interacts at most very weakly with the sta
 ndard model particles. The only purely weakly interacting particles in
  the standard model are neutrinos\, which have too low a mass to be th
 e dark matter candidates. Therefore\, there is compelling motivation f
 or physics beyond the standard model which contains weakly interacting
  massive particles. Many beyond the standard model theories predict th
 e existence of dark matter particle candidates that can be produced an
 d detected at high energy colliders\, driving experimental searches at
  the CERN LHC.
\n
\nThis thesis presents a search for dark matter part
 icles produced in association with a Higgs boson in proton-proton coll
 isions at 13 TeV. The data\, collected with the CMS detector at the LH
 C\, correspond to an integrated luminosity of 101 /fb. Higgs decay to 
 a bottom quark-antiquark pair is reconstructed to identify events of i
 nterest. The analysis is performed in exclusive categories targeting b
 oth Lorentz-boosted (merged) and resolved b-pair topologies\, covering
  a wide range of Higgs boson transverse momentum. This analysis looks 
 for statistically significant deviations from the standard model predi
 ctions\, either enhancements in specific kinematic regions or a bump i
 n the b-pair invariant mass distribution. The observed data agree with
  the standard model background predictions. Constraints are placed on 
 dark matter models predicting new particles or interactions\, such as 
 those in the simplified frameworks of baryonic-Z' and 2HDM+a. A statis
 tical combination is made with a previous search using data collected 
 in 2016 and corresponding to an integrated luminosity of 35.9 /fb. Upp
 er limits at 95% confidence level are set on the production cross sect
 ion for these models. These results improve upon the previously existi
 ng LHC limits owing to the larger integrated luminosity and improved i
 dentification of h-->bb decay. Potential improvements from an ongoing 
 CMS search using the Run-3 data are discussed\, along with the future 
 prospects at a high energy muon collider.
\n
URL:https://www.physics.wisc.edu/events/?id=9632
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