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Published March 27, 2025 | Version v2
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Probing Effective HZ$\gamma$ Couplings via H$\gamma$ Production at FCC-ee

  • 1. CERN
  • 2. Technische Universitat Munchen (DE)

Description

This work investigates the $H\gamma$ final state in $\sqrt{s}=240 GeV$ collisions at the FCC-ee, housing an electron-positron collider. 
The utilized event reconstruction is based on IDEA, a detector concept study for FCC-ee

The final state in question relies on loop-based production and provides insight in the effective $H\gamma\gamma$ and $H\gamma Z$ coupling. 
Based on the recoil mass method, the analysis comprises both, an inclusive as well as an exclusive study of the $\mathrm{H}\rightarrow b\bar{b}$ channel.
The final measurement precision is evaluated by a cut & count analysis in comparison with a likelihood fit on the photon recoil mass. 
The inclusive measurement results in an expected precision of 228% (cut & count) and 234% (likelihood fit).
The exclusive study yields a precision of 156% and 149%, respectively.  
Compatible results are found for each evaluated selection.

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Funding

European Commission
FCCIS - Future Circular Collider Innovation Study 951754

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