Abstract
Precise measurement of the Higgs boson properties is one of the important tasks for International Linear Collider (ILC) Project and its importance increases following the observation of Higgs-like boson at the Large hadron collider (LHC) experiments [1, 2] around the mass of 125-126 GeV. Taking in advantage of a clean environment and controllable collision energy by electron-positron beams, ILC is expected to determine the Higgs properties more precisely. In particular, accurate measurement of the Higgs boson branching ratios is required to confirm an agreement of masscoupling relation between particles and Higgs boson with the standard model (SM) prediction to understand the particle mass generation mechanism. In addition, observation of the deviation of couplings predicted in the SM implies an existence of the physics beyond the SM. ILC Higgs measurement program would be carried out starting from the center-of-mass (CM) energy of 250 GeV as a production threshold of Higgs boson via Higgs-strahlung process assuming the Higgs mass of 125 GeV and upgraded up to 500-1000 GeV for the study of top physics, Higgs self-coupling via double-Higgs production and new particles search. According to the light Higgs mass of 125 GeV, whole branching ratios of Higgs boson can be sizable particlulary Higgs branching ratios decaying into hadronic channels can be measured in ILC even though LHC has difficulty by large QCD background. At the several CM energies measurement, production process and the cross-section of Higgs boson is drastically varied from the Higgs-strahlung to WW-fusion processes. In this study, measurement accuracies of the products of cross section and branching ratio of Higgs boson decaying into b and c quarks, gluons, and W bosons are evaluated at the different CM energy with the full detector simulation based on the International Large Detector in ILC experiment.
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