Search For New Physics In Same Sign Dilepton Events In The Cms Detector At The Large Hadron Collider
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Search for Higgs Boson Pair Production in the bb̅ τ+ τ- Decay Channel
This thesis presents innovative contributions to the CMS experiment in the new trigger system for the restart of the LHC collisions in Run II, as well as original analysis methods and important results that led to official publications of the Collaboration. The author's novel reconstruction algorithms, deployed on the Field-Programmable Gate Arrays of the new CMS trigger architecture, have brought a gain of over a factor 2 in efficiency for the identification of tau leptons, with a very significant impact on important H boson measurements, such as its decays to tau lepton pairs and the search for H boson pair production. He also describes a novel analysis of HH → bb tautau, a high priority physics topic in a difficult channel. The original strategy, optimisation of event categories, and the control of the background have made the result one of the most sensitive concerning the self-coupling of the Higgs boson among all possible channels at the LHC.
Search for New Physics in Same-Sign Dilepton Events in the CMS Detector at the Large Hadron Collider
CMS results of a new physics search in same-sign dilepton events with b-tagged jets and missing transverse energy (MET) are being presented. These results cover the full 2012 dataset from the LHC at root(s)=8 TeV, corresponding to 19.5/fb. Isolated same-sign dilepton events are easily detected and rare in the Standard Model (SM), but they occur in abundance in some supersymmetry (SUSY) models. Hence, this channel provides a very clean, low background, search for new physics. Multiple search regions defined by the observables MET, hadronic energy (HT), and number of b-tagged jets are considered. The data agrees with the SM prediction, therefore exclusion limits at 95% C.L. are presented for various simplified SUSY models.
Electroweak Physics at the Large Hadron Collider with the ATLAS Detector
This thesis discusses searches for electroweakly produced supersymmetric partners of the gauge and the Higgs bosons (gauginos and higgsinos) decaying to multiple leptons, using pp collisions at sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple searches, as well as the first 13 TeV cross section measurement for the dominant background in these searches, WZ production. Two searches were performed using 36.1/fb of data: the gaugino search, which makes use of a novel kinematic variable, and the higgsino search, which produced the first higgsino limits at the LHC. A search using 139/fb of data makes use of a new technique developed in this thesis to cross check an excess of data above the background expectation in a search using a Recursive Jigsaw Reconstruction technique. None of the searches showed a significant excess of data, and limits were expanded with respect to previous results. These searches will benefit from the addition of luminosity during HL-LHC; however, the current detector will not be able to withstand the increase in radiation. Electronics for the detector upgrade are tested and irradiated to ensure their performance.