Search for BSM A/H → τ τ in the Fully Hadronic Decay Channel with ATLAS

by Lino Gerlach
Doctoral thesis
Date of Examination:2021-11-02
Date of issue:2021-11-16
Advisor:Prof. Dr. Stan Lai
Referee:Prof. Dr. Stan Lai
Referee:Prof. Dr. Arnulf Quadt
Persistent Address: http://dx.doi.org/10.53846/goediss-8949

 

 

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Abstract

English

In 2012, a scalar boson was found at CERN that is consistent with the properties of the Higgs boson predicted by the Standard Model (SM) of particle physics. Some theories, in particular supersymmetric models, also predict the existence of additional heavier neutral Higgs bosons. The decays of these heavy Higgs bosons to a pair of τ -leptons can be significant because of the relatively large mass of the τ -lepton and additional effects of two-Higgs-doublet models that can enhance the coupling to down-type fermions. Searches for heavy neutral Higgs bosons, A/H , as predicted by the MSSM are performed using a 139 ifb dataset recorded at the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of 13 TeV. The particle is assumed to decay into a pair of τ -leptons and the all-hadronic final state is considered for this search. The results are interpreted in different benchmark scenarios, such as the hMSSM. No excess over the SM background was observed.
Keywords: BSM; SUSY; ATLAS