which also gives a summary of the observables under study and the bins chosen in each phase space. The symbol ${\ensuremath{j_{\text{1}}}}$ (${\ensuremath{j_{\text{2}}}}$) indicates the -leading (subleading) hadronic jet in the event, while $y$ is used to denote the rapidity of a particle or a system of particles. The transverse momentum and the rapidity of the diphoton system, indicated with ${\ensuremath{\pt^{\gamma\gamma}}\xspace}$ and ${\ensuremath{\abs{y^{\gamma\gamma}}}\xspace}$, respectively, are sensitive probes of the Higgs boson production mechanism, the modeling of the QCD radiation, and the PDFs of the proton. The cosine of the polar angle in the Collins–Soper reference frame of the diphoton system [@Collins:1977iv], ${\ensuremath{\abs{\cos(\theta^*)}}\xspace}$, probes the spin and CP properties of the diphoton resonance. Observables involving jets are sensitive to the QCD parameters relevant to Higgs boson production. The separation in the azimuthal angle between the diphoton and the two-jet systems, ${\ensuremath{\abs{\Delta\phi^{\gamma\gamma,{\ensuremath{j_{\text{1}}}}{\ensuremath{j_{\text{2}}}}}}}\xspace}$, and the Zeppenfeld variable, ${\ensuremath{\abs{\overline{\eta}_{{\ensuremath{j_{\text{1}}}}{\ensuremath{j_{\text{2}}}}} - \eta_{\gamma\gamma}}}\xspace}$ [@Rainwater:1996ud], probe specifically the properties of the VBF production mechanism. The number of jets within $\abs{\eta}<2.5$, jets, and leptons are indicated with [$N_{\text{jet}}$]{}, [$N_{\text{jet}}^{\cPqb}$]{}, and [$N_{\text{lepton}}$]{}, respectively.

The inclusive fiducial cross section is also measured in restricted regions of the fiducial phase space, defined using additional criteria as follows:

-   at least one lepton, 