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PreprintCC BY 4.0HAL

Probing the Effective HZγ Coupling via Hγ Production at FCC-ee

  • Lena Herrmann
  • Sara Aumiller
  • Ken Mimasu
  • Louis Portalès
  • Michele Selvaggi
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Abstract

This work presents the first dedicated study of the e+e-→ Hγ production mode at the FCC-ee. The analysis exploits all foreseen FCC-ee running scenarios at and above the WW threshold. This study demonstrates that the e+e-→ Hγ process provides a novel and direct handle on the effective Hγγ and HZγ couplings through production, complementary to measurements based on Higgs decays. By combining measurements of multiple Higgs decay channels and center-of-mass energies, we show that an overall precision of 15% is achievable on the effective HZγ coupling. In addition, unlike decay observables, this process is also sensitive to the relative sign of the coupling and allows a full resolution of the corresponding sign ambiguity. We compare the expected sensitivity to the projected bounds from direct measurements of the γγ and Zγ branching ratios at the HL-LHC and FCC-ee, as well as projections from global fits in the SMEFT framework.

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Cite

BibTeXRIS
BibTeX
@misc{herrmann2026probing,
  title = {{Probing the Effective HZ$γ$ Coupling via H$γ$ Production at FCC-ee}},
  author = {Lena Herrmann and Sara Aumiller and Ken Mimasu and Louis Portalès and Michele Selvaggi},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.21104},
  eprint = {2609.21104},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05781664v1},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Probing the Effective HZγ Coupling via Hγ Production at FCC-ee
AU  - Lena Herrmann
AU  - Sara Aumiller
AU  - Ken Mimasu
AU  - Louis Portalès
AU  - Michele Selvaggi
PY  - 2026
DA  - 2026/09/17
PB  - HAL
DO  - 10.48550/arxiv.2609.21104
UR  - https://hal.science/hal-05781664v1
AB  - This work presents the first dedicated study of the e^+e^-→ Hγ production mode at the FCC-ee. The analysis exploits all foreseen FCC-ee running scenarios at and above the WW threshold. This study demonstrates that the e^+e^-→ Hγ process provides a novel and direct handle on the effective Hγγ and HZγ couplings through production, complementary to measurements based on Higgs decays. By combining measurements of multiple Higgs decay channels and center-of-mass energies, we show that an overall precision of 15% is achievable on the effective HZγ coupling. In addition, unlike decay observables, this process is also sensitive to the relative sign of the coupling and allows a full resolution of the corresponding sign ambiguity. We compare the expected sensitivity to the projected bounds from direct measurements of the γγ and Zγ branching ratios at the HL-LHC and FCC-ee, as well as projections from global fits in the SMEFT framework.
ER  -