探测FCC-ee上H$\gamma$产生过程中的有效HZ$\gamma$耦合
Probing the Effective HZ$γ$ Coupling via H$γ$ Production at FCC-ee
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- University of California, Irvine（加州大学尔湾分校）
- European Organization for Nuclear Research (CERN)（欧洲核子研究中心）
- University of Southampton（南安普顿大学）
- IRFU, CEA, Université Paris-Saclay（法国原子能和替代能源署IRFU，巴黎萨克雷大学）
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中文总结 AI 辅助
本文首次研究FCC-ee上e+e-→Hγ产生过程，通过产生机制直接探测有效Hγγ和HZγ耦合，实现15%精度并解决耦合符号歧义，与HL-LHC和SMEFT预测比较。
中文摘要 AI 辅助
本文首次专门研究了FCC-ee上$e^+e^-\rightarrow H\gamma$产生模式。该分析利用了FCC-ee在WW阈值及以上所有预见的运行方案。研究表明，$e^+e^-\rightarrow H\gamma$过程通过产生机制为有效$H\gamma\gamma$和$HZ\gamma$耦合提供了新颖且直接的探针，与基于希格斯衰变的测量互补。通过结合多个希格斯衰变道和质心能量的测量，我们证明在有效$HZ\gamma$耦合上可实现15%的整体精度。此外，与衰变观测量不同，该过程对耦合的相对符号敏感，并能完全解决相应的符号歧义。我们将预期灵敏度与HL-LHC和FCC-ee上$\gamma\gamma$和$Z\gamma$分支比直接测量的预计界限，以及SMEFT框架中全局拟合的预测进行了比较。
英文摘要
This work presents the first dedicated study of the $e^+e^-\rightarrow Hγ$ 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 $e^+e^-\rightarrow Hγ$ 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.
