Studies of charged Higgs bosons at the Compact Linear Collider

Abstract: The Compact Linear Collider is an electron-positron collider being developed by CERN and collaborating universities. With a center of mass energy of 3 TeV it will be used to further explore TeV scale physics after the Large Hadron Collider. This thesis is part of the simulation studies which are currently being performed for the CLIC conceptual design report (CDR). In the framework of the Minimal Supersymmetric Standard Model (MSSM) the reconstruction of charged Higgs boson pairs at CLIC is studied using a full detector simulation. Methods for measuring the mass, decay width and branching ratios of the charged Higgs boson are presented. The mass and decay width measurements focus on fully hadronically decaying charged Higgs boson pairs and it is possible to achieve a precision of a few GeV. The branching ratio can be measured with an accuracy ofabout 2%. Studies of top-tagging in fully hadronic charged Higgs boson decays are also presented. A top-tagging efficiency per event of about 60% is achieved. Top-tagging is also tested on the process H0A0 to bbbb and it is shown that top-tagging can be used to discriminate between fully hadronically decaying charged Higgs bosons and H0A0 to bbbb with a rejection power of about 6 to 1. The study is limited by the fact that there are no simulations with hadronic background from beam-beam effects and no simulations of the Standard Model backgrounds are available at the time of writing.