Measurement of the H to ZZ branching fraction at 350 GeV and 3 TeV CLIC

TL;DR

This study evaluates the statistical precision of measuring the Higgs to ZZ* decay branching fraction at 350 GeV and 3 TeV CLIC, demonstrating high-precision potential with detailed simulations.

Contribution

It provides the first detailed simulation-based assessment of Higgs to ZZ* branching fraction measurement accuracy at these energies for CLIC.

Findings

3% relative uncertainty at 3 TeV

18% relative uncertainty at 350 GeV

Measurement uses semileptonic final states with high luminosity

Abstract

In this paper we present results of determination of the statistical precision of Higgs branching fraction measurement, for Higgs decay to ZZ$^\ast$ pairs at 3 TeV and 350 GeV CLIC. Measurements are simulated with the CLIC_ILD detector model, taking into consideration all relevant physics and beam-induced background processes. It is shown that the product of the branching fraction BR(${H\rightarrow\thinspace ZZ^\ast}$) and the Higgs production cross-section can be measured with a relative statistical uncertainty of 3% (18%) at 3 TeV (350 GeV) center-of-mass energy, using semileptonic final states and assuming integrated luminosity of 5 (1) ab$^{-1}$.