Measuring the Higgs Branching Fraction into two Photons at Future Linear Colliders

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We examine the prospects for measuring the branching fraction of a Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA linear collider, assuming an integrated luminosity of 1 ab⁻¹ and center-of-mass energies of 350 GeV and 500 GeV. The Higgs boson is produced in association with a fermion pair via the Higgsstrahlung process → ZH, with Z → or, or the WW fusion reaction e+e- → νₑ νₑ H. A relative uncertainty on BF() of 16% can be achieved in unpolarized collisions at √s= 500 GeV, while for √s= 350 GeV the expected precision is slightly poorer. With appropriate initial state polarizations ΔBF()/BF() can be improved to 10%. If this measurement is combined with the expected error for the total Higgs width, a precision of 10% on the Higgs boson partial width appears feasible.