Determining Higgs boson width at electron-positron colliders

Abstract

Probing Higgs width ${\Gamma }_h$ is critical to test the Higgs properties. In this work we propose to measure ${\Gamma }_h$ at the $e^{+}{e}^{-}$ collider with a model-independent analysis under the Standard Model Effective Field Theory framework. We demonstrate that making use of the cross section measurements from $e^{+}{e}^{-}\to Zh$, $e^{+}{e}^{-}\to {\nu }_e{\bar{\nu }}_{e}h$ production and Higgs decay branching ratios $h\to W{W}^{\ast }/Z{Z}^{\ast }/\gamma \gamma$, one could determine ${\Gamma }_h$ at a percentage level with a center of mass energy $\sqrt{s}=250$ and 350 GeV and integrated luminosity $5{\mathrm{ab}}^{-1}$. This conclusion would not depend on the assumption of the fermion Yukawa interactions. We further apply this result to constrain the fermion Yukawa couplings and it shows that the couplings could be well constrained.

8 pages, 7 figures, the published version in PLB

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• Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs
• Constraining Higgs boson effective couplings at electron-positron colliders
• Limiting Top-Higgs Interaction and Higgs-Boson Width from Multi-Top Productions
• Probing the electroweak symmetry breaking with Higgs production at the LHC
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Cited by in corpus (4)

• Discriminating between Higgs Production Mechanisms via Jet Charge at the LHC
• Higgs couplings in SMEFT via Zh production at the HL-LHC
• Optimal estimation of Higgs-Gauge Boson couplings at the future $e^{+}{e}^{-}$ colliders
• $WWh$ anomalous couplings at one loop from a seesaw variant of radiatively-induced neutrino masses