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Kinematic Studies in the Search for a Low-Mass CP-Odd Higgs Boson for Mass Hypotheses in the Range from 80GeV to 110GeV
The two-Higgs-doublet model extension of the Standard Model (SM) of particle physics predicts the existence of not only one Higgs boson, which was discovered in 2012 by the ATLAS and CMS experiments at the LHC, but four additional Higgs bosons. One of the predicted bosons is the CP-odd A boson.
The goal of this analysis is to discover this boson with the ATLAS detector. Finding evidence for the occurrence of new particles could give insights into new physics beyond the SM. These particles are predicted to be rarer than SM particles and a high production rate and excellent detectors are needed. The LHC is able to provide those conditions, as protons collide with a center-of-mass energy of √s = 13TeV, thus having high production rates of heavy particles.
Furthermore, methods to distinguish SM processes from new physics are needed. This thesis is based on a cut-based analysis, meaning selection criteria on certain kinematic variables to help to reduce background events and improve the significance of the signal are being used. The goal for this thesis is to determine additional cuts to further improve this ratio.