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Feasibility of a measurement of the partial decay width of theintermediate-mass Higgs boson into two photons at a photon-photon collider isstudied by a simulation. The QCD radiative correction for quark pair backgroundprocesses is taken into account for the realistic background estimation. It isfound that the two-photon decay width can be measured with the statisticalerror of 7.6 % with about one year of experiment. The impact of the measurementof the two-photon decay width to look for the new physics beyond isdemonstrated.Comment: 20 pages, 7 figure

Measuring the two-photon decay width of intermediate-mass Higgs bosons at a photon-photon collider