Anatomy of Higgs boson decays into γγ and γZ within the electroweak chiral Lagrangian in the Rξ gauges

@article{Herrero2020AnatomyOH,
  title={Anatomy of Higgs boson decays into 
$\gamma$$\gamma$
 and 
$\gamma$Z
 within the electroweak chiral Lagrangian in the 
R$\xi$
 gauges},
  author={Maria Herrero and Roberto A. Morales},
  journal={Physical Review D},
  year={2020},
  volume={102},
  pages={075040}
}
In this work, we study the Higgs boson decays into two photons and into one photon and one $Z$ gauge boson within the context of the nonlinear effective field theory called the electroweak chiral Lagrangian (EChL). We present a detailed computation of the corresponding amplitudes to one-loop level in the covariant ${R}_{\ensuremath{\xi}}$ gauges. We assume that the fermionic loop contributions are as in the Standard Model and focus here just in the computation of the bosonic loop contributions… 
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