UBC Faculty Research and Publications

Measurement of the properties of Higgs boson production at √s = 13 TeV in the H → γγ channel using 139 fb−1 of pp collision data with the ATLAS experiment ATLAS Collaboration


Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb−1 of pp collision data at √ s = 13 TeV collected by the ATLAS experiment at the LHC. The analysis is based on the defnition of 101 distinct signal regions using machine-learning techniques. The inclusive Higgs boson signal strength in the diphoton channel is measured to be 1.04+0.10 −0.09. Cross-sections for gluon-gluon fusion, vectorboson fusion, associated production with a W or Z boson, and top associated production processes are reported. An upper limit of 10 times the Standard Model prediction is set for the associated production process of a Higgs boson with a single top quark, which has a unique sensitivity to the sign of the top quark Yukawa coupling. Higgs boson production is further characterized through measurements of Simplifed Template Cross-Sections (STXS). In total, cross-sections of 28 STXS regions are measured. The measured STXS crosssections are compatible with their Standard Model predictions, with a p-value of 93%. The measurements are also used to set constraints on Higgs boson coupling strengths, as well as on new interactions beyond the Standard Model in an efective feld theory approach. No signifcant deviations from the Standard Model predictions are observed in these measurements, which provide signifcant sensitivity improvements compared to the previous ATLAS results.

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