Title: Two photon width and phase measurement from the SM Higgs decays into WW and ZZ at the photon collider
Abstract: Production of the Standard Model Higgs-boson at the photon collider at TESLA is studied for the Higgs-boson masses above 170 GeV. By reconstructing WW and ZZ final states, not only the h → γγ partial width but also the phase of the scattering amplitude can be measured. This opens a new window onto the precise determination of the Higgs-boson couplings. A photon collider has been proposed as a natural extension of the ee linear collider TESLA [1]. It is the ideal place to study the properties of the Higgs-boson and the electroweak symmetry breaking (EWSB). This contribution summarizes results of [2], where the feasibility of measuring Higgs-boson production in WW and ZZ decay channels has been studied for Higgs-boson mass above 170 GeV. We study the signal, ie. the Higgs-boson decays into vector bosons, and the background from direct vector-bosons production. For the ZZ final state the direct, ie. non-resonant γγ → ZZ process is possible at the loop level only, while the non-resonant WW pair production is a tree-level process, and is expected to be large. Also an interference between the signal of WW production via the Higgs resonance and the background from direct production can be large. The measurement of the interference contribution allows us to access an information about the phase of the h → γγ amplitude, φγγ . For the Higgs-boson masses around
Publication Year: 2002
Publication Date: 2002-11-26
Language: en
Type: article
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