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A precise Higgs mass measurement at the ILC and test beam data analyses with CALICE

Abstract : Utilizing Monte Carlo tools and test-beam data, some basic detector performance properties are studied for the International Linear Collider (ILC). The contributions of this thesis are mainly twofold, first, a study of the Higgs mass and cross section measurements at the ILC (with full simulation to the e^ e^- → HZ → Hμμ channel and backgrounds); and second, an analysis of test-beam data of the Calorimeter for Linear Collider Experiment (CALICE). For a most general type of Higgs particle with 120GeV the mass, setting the center-of-mass energy to 230GeV and with an integrated luminosity of 500fb^-1, a precision of 38.4MeV is obtained in a model independent analysis for the Higgs boson mass measurement, while the cross section could be measured to 5%; if we make some assumptions about the Higgs boson's decay, for example a Standard Model Higgs boson with a dominant invisible decay mode, the measurement result can be improved by 25% (achieving a mass measurement precision of 29MeV and a cross section measurement precision of 4%). For the CALICE test-beam data analysis, our work is mainly focused upon two aspects: data quality checks and the track-free ECAL angular measurement. Data quality checks aim to detect strange signals or unexpected phenomena in the test-beam data so that one knows quickly how the overall data taking quality is. They also serve to classify all the data and give useful information for the later offline data analyses. The track-free ECAL angular resolution algorithm is designed to precisely measure the direction of a photon, a very important component in determining the direction of the neutral components in jets. We found that the angular resolution can be well fitted as a function of the square root of the beam energy (in a similar way as for the energy resolution) with a precision of approximately 80mrad / √E/GeV in the angular resolution.
Keywords : ILC Higgs mass CALICE ECAL
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M. Ruan. A precise Higgs mass measurement at the ILC and test beam data analyses with CALICE. Physics [physics]. Université Paris Sud - Paris XI; Tsinghua University, 2008. English. ⟨tel-00481228⟩

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