Associated Higgs production in lepton-photon collisions at FCC-ee

TL;DR

This paper proposes a new Higgs production mechanism in lepton-photon collisions at FCC-ee, demonstrating its potential to measure Higgs properties with low background and feasibility at planned energies.

Contribution

It introduces a novel Higgs production process in lepton-photon collisions and assesses its observability at FCC-ee energies, aiding precise Higgs sector studies.

Findings

Process observable at 365 GeV center-of-mass energy.

Process observable within a few months at 500 GeV.

Uses a Monte Carlo generator for realistic simulations.

Abstract

Following the HL-LHC era, proposed lepton colliders highlight the need to study various important Higgs boson production mechanisms to precisely probe the Standard Model Higgs sector. We propose a novel mechanism $e^\pm \gamma \rightarrow {\bar \nu}_e (\nu_e) H W^\pm$, which can be useful to study Higgs boson properties. This channel is relatively free from the background and can be used to measure the Higgs boson properties, in particular $WWH$ coupling. We examine the viability of this production mechanism. We show that the process can be observed at the planned FCC-ee with the center-of-mass energy of 365 GeV. At the center-of-mass energy of 500 GeV, the process can be observed within a few months of the operation. We use an in-house Monte Carlo event generator that simultaneously incorporates the photon distribution and electron/positron distribution. Our work is also a step towards realistic simulations of lepton- and photon-initiated processes at lepton colliders.