ISSN:
1434-6052
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1140/epjc/s2003-01304-4
