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

Abstract The inclusive Higgs boson production cross-section is measured in the di-photon and the $$ZZ^* \rightarrow 4 \ell $$ Z Z ∗ → 4 ℓ decay channels using 31.4 and 29.0 fb $$^{-1}$$ - 1 of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of $$\sqrt{s}=13.6$$ s = 13.6 $$\text {TeV}$$ TeV . To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are $$\sigma _{\textrm{fid},\gamma \gamma } = $$ σ fid , γ γ = $$76^{+14}_{-13}$$ 76 - 13 + 14 fb, and $$\sigma _{\textrm{fid},4 \ell } =$$ σ fid , 4 ℓ = $$2.80\, \pm \, 0.74$$ 2.80 ± 0.74 fb, in agreement with the corresponding Standard Model predictions of $$67.6 \pm 3.7 $$ 67.6 ± 3.7 fb and $$3.67 \pm 0.19 $$ 3.67 ± 0.19 fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of $$\sigma (pp \rightarrow H) = 67^{+12}_{-11}$$ σ ( p p → H ) = 67 - 11 + 12 pb and $$46 \pm 12$$ 46 ± 12 pb at 13.6 $$\text {TeV}$$ TeV from the di-photon and $$ZZ^* \rightarrow 4 \ell $$ Z Z ∗ → 4 ℓ measurements respectively. The two measurements are combined into a total cross-section measurement of $$\sigma (pp \rightarrow H)= 58.2 \pm 8.7$$ σ ( p p → H ) = 58.2 ± 8.7 pb, to be compared with the Standard Model prediction of $$\sigma (pp \rightarrow H)_\textrm{SM} = 59.9 \pm 2.6 $$ σ ( p p → H ) SM = 59.9 ± 2.6

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