E. Boos, J. Brient, D. Reid, H. Schreiber, R. Shanidze
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Measuring the Higgs branching fraction into two photons at future linear e+e− colliders
We examine the prospects for measuring the γγ branching fraction of a Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA linear e+e− 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 e+e−→ZH, with Z→qq or νν, or the WW fusion reaction e+e−→νeνeH. A relative uncertainty on BF(H→γγ) of 16% can be achieved in unpolarized e+e− collisions at s=500 GeV, while for s=350 GeV the expected precision is slightly poorer. With appropriate initial state polarizations ΔBF(H→γγ)/BF(H→γγ) can be improved to 10%.
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