Jan 10 – 14, 2022
Online only
Europe/London timezone

Electron Yukawa determination at FCC-ee

Jan 11, 2022, 5:30 PM
20m
Online only

Online only

Parallel session talk Future experiments and facilities Future experiments and facilities

Speaker

David d'Enterria (CERN)

Description

Measuring the electron Yukawa is impossible in Higgs boson decays, H -> e+e- , given the smallness of the electron mass that leads to a vanishingly small decay branching fraction. The only direct method to extract the Higgs-electron coupling is through resonant s-channel production in e+e- collisions running at the Higgs pole mass. Such a measurement is possible at the FCC-ee provided one can monochromatize the beams, leading to a center-of-mass energy spread not much larger than the Higgs boson width of ~4 MeV, as well as having a prior accurate and precise knowledge of the Higgs boson mass, within MeV uncertainties. Under such conditions, a study combining 10 different Higgs decay modes indicates that a ~1.3sigma significance for the e+e- -> H process can be reached, above the (much larger) backgrounds, for every 10 ab-1 of integrated luminosity per FCC-ee interaction point (IP). Depending on the number of IPs and years running at the Higgs pole, such a measurement will provide the only means known to access the electron Yukawa.

Primary author

Markus Klute (Massachusetts Inst. of Technology (US))

Presentation materials