Measurement of Higgs boson production and search for new resonances in final states with photons and Z bosons, with the ATLAS detector

<!--HTML--><p>Higgs boson decays to pairs of photons and Z bosons have played a key role in its discovery and the determination of its properties.<br>The decay of the Higgs boson to a Z boson and a photon is a rare process mediated by loops, which has not been observed thus far. Measuring its rate could provide valuable new understanding of the couplings of the Higgs boson, while also offering a glimpse into possible new phenomena potentially contributing to the loop.<br>This seminar will present the result of the search for new neutral scalars in the γγ final state, with masses ranging from 66 GeV to 110 GeV, using 140 fb-1 of LHC Run 2 data collected at 13 TeV.<br>It will also highlight the recent combination of the ATLAS and CMS measurements of Higgs boson production and decay in the Zγ final state, using 140 fb-1 of LHC Run 2 data collected at 13 TeV. The combined results provide the first evidence for the H→Zγ decay.<br>Finally, the presentation will report the latest ATLAS measurements of the cross-sections for Higgs boson production and decay into γγ and ZZ final states, as well as their combination. The results are based on 29.0 to 31.4 fb-1 of pp collision data collected in 2022 at a center of mass energy of 13.6 TeV during Run 3 of the LHC.</p><p><strong>Refreshments will be served at 10:30</strong></p>