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M easur em ent of th e $\mathit{H Z\gamma}$ coupling at th e futur e lin ear e+ e- collid er

Authors:	M Dubinin H J Schreiber A Vologdin

Institution:	(1) Institute of Nuclear Physics, Moscow State University, 119 992 Moscow, Russia;(2) DESY Zeuthen, 15735 Zeuthen, Germany

Abstract:	We examine the prospects for measuring the $H Z \gamma$ 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 $\nu_e \bar{\nu_e}$ via the W W fusion reaction $e^+e^- \rightarrow \nu_e \bar{\nu_e} H$ , followed by the rare decay into a Z boson and a photon, $H \rightarrow Z \gamma$ . 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 $\Delta$ BF( $H \rightarrow Z \gamma$ )/BF( $H \rightarrow Z \gamma$ ), or the precisions on the $H \rightarrow Z \gamma$ partial width, can be improved to 17% and provide valuable information on the $H Z \gamma$ 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 $H \rightarrow Z \gamma$ branching fraction.Received: 5 March 2003, Revised: 14 July 2003, Published online: 5 September 2003

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