Search for Mono-Higgs-Boson to [tau] Pairs at the LHC with [squareroot]s
Author | : Garrett Ned Funk |
Publisher | : |
Total Pages | : |
Release | : 2018 |
ISBN-10 | : 0438629914 |
ISBN-13 | : 9780438629912 |
Rating | : 4/5 (14 Downloads) |
Book excerpt: A search for dark matter is performed using the proton-proton collision dataset recorded by the CMS detector at the CERN LHC during the data-taking period of 2016. The dataset corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at 13 TeV. The search is performed for two theory models, both of which incorporate the standard model Higgs boson into dark matter production. The signature in both theory models is a standard model Higgs boson plus missing momentum from the dark matter, which does not interact with the CMS detector. This signature is dubbed 'mono-Higgs'. The first theory model uses an additional set of Higgs sector parameters and incorporates a new mediator particle and a pseudoscalar Higgs boson into dark matter production. The second model introduces a new mediator that carries baryon number symmetry. The analysis presented in this thesis is specifically focused on the final state with a standard model Higgs boson decay to [tau] leptons. A range of parameter space is excluded with 95% confidence for both models, and an advanced technique is used to extend the exclusion for a particular range of one model. In the first model, mediator masses between 700 and 1200 GeV are excluded for a pseudoscalar mass of 300 GeV and a dark matter mass of 100 GeV. In the second model, mediator masses up to 500 GeV are excluded for a dark matter mass of 1 GeV.