Measurement of $\ddot{I}ƒ(H\hat{I}{½}_e\overline{\hat{I}{½}_e})\times BR(H\to Z{Z}^{\ast })$ and Higgs production in $ZZ$ fusion at a 1.4 TeV CLIC collider

Abstract

This paper presents the potential measurement at 1.4 TeV CLIC of the cross-section (times branching ratio) of the Higgs production via $WW$ fusion with the Higgs subsequently decaying in $Z{Z}^{\ast }$, $\ddot{I}ƒ(H\hat{I}{½}_e\overline{\hat{I}{½}_e})\times BR(H\to Z{Z}^{\ast })$, and of the Higgs production via $ZZ$ fusion with the Higgs subsequently decaying in $b\bar{b}$, $\ddot{I}ƒ(He{}^{+}e{}^{-})\times BR(H\to b\bar{b})$. For the $H\to Z{Z}^{\ast }$ decay the hadronic final state, $Z{Z}^{\ast }\to q\bar{q}q\bar{q}$, and the semi-leptonic final state, $Z{Z}^{\ast }\to q\bar{q}{l}^{+}{l}^{-}$, are considered. The results show that $\ddot{I}ƒ(H\hat{I}{½}_e\overline{\hat{I}{½}_e})\times BR(H\to Z{Z}^{\ast })$ can be measured with a precision of 18.3% and 6% for the hadronic and semi-leptonic channel, respectively. $\ddot{I}ƒ(He{}^{+}e{}^{-})\times BR(H\to b\bar{b})$ can be measured with a precision of 1.7%. This measurement also contributes to the determination of the Higgs coupling to the $Z$ boson, $g_{H_{ZZ}}$.

Talk presented at the International Workshop on Future Linear Colliders (LCWS14), Belgrade, Serbia, 6-10 October 2014