Measurement of the HZ gamma coupling at the future linear e+ e- colliderстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We examine the prospects for measuring the H Z γ coupling of a standard model-like Higgs boson with a mass between 120 and 160 GeV at the future TESLA linear e + e - collider, assuming an integrated luminosity of 1 ab-1 and a center-of-mass energy of 500 GeV. We consider the Higgs boson produced in association with ν_e bar{ν_e} via the W W fusion reaction e^+e^- rightarrow ν_e bar{ν_e} H, followed by the rare decay into a Z boson and a photon, H rightarrow Z γ. Accounting for all main background contributions, a precision of 27% can be achieved in unpolarized e + e - collisions for M H = 140 GeV. With appropriate initial state polarisations ΔBF( H rightarrow Z γ)/BF( H rightarrow Z γ), or the precisions on the H rightarrow Z γ partial width, can be improved to 17% and provide valuable information on the H Z γ coupling. For M H = 120 and 160 GeV, the small significance of the signals in unpolarized collisions sets upper limits of 79% respectively 72% at 90% confidence level on the H rightarrow Z γ branching fraction.