Toward a Measurement of the Higgs Boson Mass with Natural-Width Precision at FCC-ee
Jan Eysermans, Ang Li, Gregorio Bernardi, Christoph Paus, Emmanuel Perez, Michele Selvaggi
Abstract
Higgs boson mass measurements with sub-10 MeV precision enable sub-percent determinations of Higgs boson couplings and prevent the Higgs boson mass from becoming a limiting input to electroweak fits. Probing the electron Yukawa coupling through resonant Higgs boson production requires a precision comparable to the Higgs boson natural width of approximately 4 MeV. Using the leptonic ZH recoil channels, we show that FCC-ee can reach a Higgs boson mass precision of 4 MeV, including statistical and systematic uncertainties, thereby enabling this unique measurement. We identify the detector and accelerator performance required to reach this precision.
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