This thesis studies collider phenomenology of physics beyond the
Standard Model at the Large Hadron Collider (LHC). It also explores
in detail advanced topics related to Higgs boson and supersymmetry
- one of the most exciting and well-motivated streams in particle
physics. In particular, it finds a very large enhancement of
multiple Higgs boson production in vector-boson scattering when
Higgs couplings to gauge bosons differ from those predicted by the
Standard Model. The thesis demonstrates that due to the loss of
unitarity, the very large enhancement for triple Higgs boson
production takes place. This is a truly novel finding. The thesis
also studies the effects of supersymmetric partners of top and
bottom quarks on the Higgs production and decay at the LHC,
pointing for the first time to non-universal alterations for two
main production processes of the Higgs boson at the LHC-vector
boson fusion and gluon-gluon fusion. Continuing the exploration of
Higgs boson and supersymmetry at the LHC, the thesis extends
existing experimental analysis and shows that for a single decay
channel the mass of the top quark superpartner below 175 GeV can be
completely excluded, which in turn excludes electroweak
baryogenesis in the Minimal Supersymmetric Model. This is a major
new finding for the HEP community. This thesis is very clearly
written and the introduction and conclusions are accessible to a
wide spectrum of readers.
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