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The inclusive Higgs boson production cross-section is measured in thedi-photon and the $ZZ^* \to 4 \ell$ decay channels using 31.4 and 29.0fb$^{-1}$ of $pp$ collision data respectively, collected with the ATLASdetector at a centre-of-mass energy of $\sqrt{s}=13.6$ TeV. To reduce the modeldependence, the measurement in each channel is restricted to a particle-levelphase space that closely matches the channel's detector-level kinematicselection, and it is corrected for detector effects. These measured fiducialcross-sections are $\sigma_{\mathrm{fid},\gamma \gamma} = 76^{+14}_{-13}$ fb,and $\sigma_{\mathrm{fid},4 \ell} = 2.80 \pm 0.74$ fb, in agreement with thecorresponding Standard Model predictions of $67.6 \pm 3.7 $ fb and $3.67 \pm0.19 $ fb. Assuming Standard Model acceptances and branching fractions for thetwo channels, the fiducial measurements are extrapolated to the full phasespace yielding total cross-sections of $\sigma(pp \to H) = 67^{+12}_{-11}$ pband $46 \pm 12$ pb at $13.6$ TeV from the di-photon and $ZZ^* \to 4 \ell$measurements respectively. The two measurements are combined into a totalcross-section measurement of $\sigma(pp \to H)= 58.2 \pm 8.7$ pb, to becompared with the Standard Model prediction of $\sigma(pp \to H)_\mathrm{SM} =59.9 \pm 2.6 $ pb.

european physical journal. c, particles and fields

Measurement of the $H \to \gamma \gamma$ and $H \to ZZ^* \to 4 \ell$  cross-sections in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS  detector