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- W1504795512 abstract "Diboson physics provides insight into a wide variety of processesthat are produced copiously at the LHC. Of particular interestare events where leptons and neutrinos are produced, strong signaturesof electroweak physics. The study of electroweak physics isessential to understanding the Standard Model and in searchesfor phenomena outside the Standard Model.The most sensitive channels that contributed to the discoveryof the Higgs boson searched for decays to dibosons.This thesis will present four analyses that utilizecharged leptons and neutrinos whose presence areinferred from the missing transverse momentum.Two measurements of StandardModel cross sections will be presented. The WW cross section is measuredusing 35 pb-1 of data collected in 2010 and isone of the earliest measurements of diboson processesat the LHC. The ZZ cross section is measured using4.6 fb-1 of data collected in 2011. A searchfor the Higgs in the WW decay channel is presentedalso using 4.6 fb-1 of data collected in 2011.This analysis did not have the sensitivity to discover theHiggs boson, but when data were added in 2012 this channelcontributed significantly to its discovery.Finally a search for anomalous invisible decays of the Higgs bosonusing 4.6 fb-1 ofdata taken in 2011 and 13.1 fb-1 of data taken in 2012will be presented.This search is sensitive to new physics that couples to the Higgsboson that would result in an increased rate of decays to invisible particles.One possible scenario is that dark matter couples to the Higgs boson.If the mass of the dark matter particle is less than half of themass of the Higgs boson decays to dark matter increaseits invisible branching fraction.Dark matter is a significant contributionto the makeup of the universe, but very little is known about it.This search provides additional limits on how dark matter can coupleto the Standard Model.No excess of events is observed in this search andlimits are placed on the allowed invisible branching fraction.These limits are interpreted in the context of simple Higgs portalmodels to place constraints on the allowed dark matter mass andinteraction cross section. The results are compared withcurrent limits on dark matter and place significant restrictionson the allowed dark matter mass and cross section within these models." @default.
- W1504795512 created "2016-06-24" @default.
- W1504795512 creator A5047438403 @default.
- W1504795512 date "2013-01-01" @default.
- W1504795512 modified "2023-09-23" @default.
- W1504795512 title "A Search for Dark Matter Through Invisible Decays of the Higgs Boson With the Atlas Detector at the LHC" @default.
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