Jet Energy Measurements at ILC:Calorimeter DAQ Requirements and Application in Higgs Boson Mass Measurements

The idea of spontaneous symmetry breaking as the mechanism through which elementaryparticles gain mass has been confirmed by the discovery of the Higgs boson at the CERNLarge Hadron Collider. Studying the Higgs boson properties are of great importance toverify the Standard Model predictions. Any deviation from these predictions could uncoverphysics beyond the Standard Model. The mass of the Higgs boson is one of the importantparameters of the Standard Model. The precise determination of the Higgs boson mass is ofinterest in its own right and also for other Higgs physics studies since it enters as parametricuncertainty into the extraction of the partial width from branching ratio measurements.The International Linear Collider (ILC) is a future polarised e+e- collider designedfor precision physics studies. The Higgs boson decay to a pair of bottom quarks H ! bbhas the largest branching ratio of all Higgs decays, providing a large dataset for physicsanalyses. The possibility of measuring the Higgs boson mass in the e+e- ! ZH ! qqbbchannel is investigated in this thesis for centre-of-mass energies of 350 GeV and 500 GeV.Since the Higgs boson mass is reconstructed from two b jets, the jet energy resolution hasa high impact on the measurement. A new method to estimate the jet energy resolution foreach jet individually is developed in this thesis. The jet-specific energy resolution is thenused in the analysis for the Higgs boson mass measurements. Various strategies for theHiggs boson mass measurement are investigated. For an integrated luminosity of 1000 fb