Measurements of $H\rightarrow W^+W^-$ in the Fully Leptonic Decay Mode at the FCC-ee

TL;DR

This paper evaluates the expected precision of measuring the Higgs boson decay to W bosons at the FCC-ee collider, showing potential uncertainties of a few percent at two different energies and luminosities.

Contribution

It provides projected measurement precisions for Higgs to WW decay at the FCC-ee, considering two energy and luminosity scenarios, which was not previously detailed.

Findings

Achieves 2.9% uncertainty at 240 GeV

Achieves 6.8% uncertainty at 365 GeV

Assesses measurement capabilities for future collider scenarios

Abstract

The expected precision on measuring the $\sigma(e^+ e^- \rightarrow ZH) \times Br(H\rightarrow W^+W^-)$ in the fully leptonic decay mode at the Future Circular Collider (FCC) is presented. We consider two FCC-ee scenarios: $\sqrt{s} =240$ GeV centre-of-mass energy with a luminosity of 10.8$\rm{~ab}^{-1}$ and $\sqrt{s} =365$ GeV centre-of-mass energy with a luminosity of 3.12$\rm{~ab}^{-1}$. Our results indicate that a relative uncertainty of 2.9\% and 6.8\% can be achieved on measurements of $\sigma(e^+ e^- \rightarrow ZH) \times Br(H\rightarrow W^+W^-)$ in the fully leptonic decay mode at $\sqrt{s} =240$ GeV and $\sqrt{s} =365$ GeV, respectively.