Search for resonant di-Higgs production in bb + $\tau\tau$ final states in pp collisions at $\sqrt{s}$ = 13 TeV

In this thesis, an analysis is presented that searches for the decay of a heavy scalar Higgs boson $\text{X}$ into the discovered $125\,\text{GeV}$ Higgs boson $\text{H}_{\text{SM}}$ and another light scalar Higgs boson $\text{Y}$. Such a process is predicted e.g. by the extended Higgs sector of the NMSSM. With respect to a previous search, this search significantly extends the signal phase space targeted and signal processes considered, including resolved and boosted topologies of the final state particles and different decays of the Higgs bosons. The presence of Higgs bosons is inferred indirectly through the decay products, focusing on the decays into b quark and tau lepton pairs. The analysis uses data collected by the Compact Muon Solenoid (CMS) experiment at the LHC that have been recorded during the 2018 data taking period corresponding to an integrated luminosity of $59.8\,\text{fb}^{−1}$.