Measurement of ${\sigma(H\nu_e\bar{\nu_e})\times BR(H\rightarrow ZZ^\ast)}$ and Higgs production in $ZZ$ fusion at a 1.4 TeV CLIC collider

TL;DR

This paper evaluates the potential precision in measuring Higgs production cross-sections via $WW$ and $ZZ$ fusion at a 1.4 TeV CLIC collider, focusing on specific decay channels and their implications for Higgs coupling measurements.

Contribution

It provides the first detailed estimates of measurement precisions for Higgs production via fusion processes at 1.4 TeV CLIC, including decay channels and their impact on coupling determination.

Findings

$H ightarrow ZZ^ ext{*}$ cross-section measurable with 18.3% (hadronic) and 6% (semi-leptonic) precision.

$H ightarrow bar{b}$ via $ZZ$ fusion measurable with 1.7% precision.

Measurement improves understanding of Higgs-Z coupling $g_{H_{ZZ}}$.

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 $ZZ^\ast$, ${\sigma(H\nu_e\bar{\nu_e})\times BR(H\rightarrow ZZ^\ast)}$, and of the Higgs production via $ZZ$ fusion with the Higgs subsequently decaying in $b\bar{b}$, ${\sigma(He{^+}e{^-})\times BR(H\rightarrow b\bar{b})}$. For the $H\rightarrow ZZ^\ast$ decay the hadronic final state, ${ZZ^\ast\rightarrow q\bar{q}q\bar{q}}$, and the semi-leptonic final state, ${ZZ^\ast\rightarrow q\bar{q}l^+l^-}$, are considered. The results show that ${\sigma(H\nu_e\bar{\nu_e})\times BR(H\rightarrow ZZ^\ast)}$ can be measured with a precision of 18.3% and 6% for the hadronic and semi-leptonic channel, respectively. ${\sigma(He{^+}e{^-})\times BR(H\rightarrow b\bar{b})}$ can be measured with a precision of 1.7%. This measurement also contributes to the determination of the Higgs coupling to the $Z$ boson, $g_{H_{ZZ}}$.