Prospects for $\gamma \gamma \to H$ and $\gamma \gamma \to W^{+}W^{-}$ measurements at the FCC-ee

TL;DR

This paper evaluates the potential to measure two-photon production of the Higgs boson and W boson pairs at the FCC-ee collider, using simulations to assess detection feasibility and background suppression.

Contribution

It presents a detailed simulation-based analysis of measuring gamma-gamma initiated Higgs and W pair production at FCC-ee, including realistic detector effects and background removal strategies.

Findings

Observation of both processes is feasible at FCC-ee with expected luminosities.

Simulations show effective background suppression and detection efficiencies.

Measurement prospects are promising at center-of-mass energies of 160 and 240 GeV.

Abstract

We study the possibilities for the measurement of two-photon production of the Higgs boson (in the $b \bar{b}$ decay channel), and of $W^{+}W^{-}$ pairs (decaying into four jets) in $e^{+}e^{-}$ collisions at the the Future Circular Collider (FCC-ee). The processes are simulated with the PYTHIA and MADGRAPH 5 Monte Carlo codes, using the effective photon approximation for the $e^{+}e^{-}$ photon fluxes, at center-of-mass energies $\sqrt{s} = $ 160 GeV and 240 GeV. The analyses include electron-positron tagging, realistic acceptance and reconstruction efficiencies for the final-state jets, and selection criteria to remove the backgrounds. Observation of both channels is achievable with the expected few ab$^{-1}$ integrated luminosities at FCC-ee.