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arXiv · 2608.12071

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
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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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Jan Eysermans, Ang Li, Gregorio Bernardi, Christoph Paus, Emmanuel Perez, Michele Selvaggi. 2026-08-12. Toward a Measurement of the Higgs Boson Mass with Natural-Width Precision at FCC-ee. https://arxiv.org/abs/2608.12071

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