Measurement of the H→γγ and H→ZZ→4l cross-sections in <i>pp</i> collisions at s=13.6 TeV with the ATLAS detector

Abstract

<p>The inclusive Higgs boson production cross-section is measured in the di-photon and the ZZ<sup/>→ 4 ℓ decay channels using 31.4 and 29.0 fb <sup/> of pp collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of s=13.6 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 σ<inf/> <inf/> <inf/> <inf/>= 76-13+14 fb, and σ<inf/> <inf/> <inf/> <inf/>= 2.80±0.74 fb, in agreement with the corresponding Standard Model predictions of 67.6 ± 3.7 fb and 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 σ(pp→H)=67-11+12 pb and 46 ± 12 pb at 13.6 TeV from the di-photon and ZZ<sup/>→ 4 ℓ measurements respectively. The two measurements are combined into a total cross-section measurement of σ(pp→ H) = 58.2 ± 8.7 pb, to be compared with the Standard Model prediction of σ(pp→ H) <inf/>= 59.9 ± 2.6 pb.</p>