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

Abstract

Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb−1 of pp collision data at $$ \sqrt{s} $$ s = 13 TeV collected by the ATLAS experiment at the LHC. The analysis is based on the definition of 101 distinct signal regions using machine-learning techniques. The inclusive Higgs boson signal strength in the diphoton channel is measured to be $$ {1.04}_{-0.09}^{+0.10} $$ 1.04 − 0.09 + 0.10 . Cross-sections for gluon-gluon fusion, vector-boson 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 Simplified Template Cross-Sections (STXS). In total, cross-sections of 28 STXS regions are measured. The measured STXS cross-sections 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 effective field theory approach. No significant deviations from the Standard Model predictions are observed in these measurements, which provide significant sensitivity improvements compared to the previous ATLAS results.

Radiative corrections to decay branching ratios of the CP-odd Higgs boson in two Higgs doublet models

“…In this ratio, the SM pieces approximately cancel out between the numerator and denominator, so that we can directly assess the magnitude of BSM effects. This quantity can also be compared directly to current experimental measurements [29,30,88,89] or future prospects [33] e.g. it corresponds to the quantity B γγ in Ref.…”

“…( 23). for κ λ shown on the horizontal axis is stopped at 6.3, which is the current upper bound on this effective coupling [29,30,89,90].…”

Common origin of θ13 and dark matter within the flavor symmetric scoto-seesaw framework

“…The SM Higgs boson has a mass of m h ≃ 125 GeV [82,123], and one of the main decay channels is the diphoton, where the SM rate for h → γγ is dominated by the W-boson loop contribution. The signal strength of h → γγ is the ratio between the observed cross section pp → h → γγ and the same .…”

“…Γ h FSS1,SM is the total decay width for these models. The h → γγ decay is experimentally well established, and in the LHC, the signal strength of h → γγ is R = 1.04 +0.10 −0.09 [82]. While computing R γγ , we take for the total decay width of the Higgs boson Γ h SM = 4.07 × 10 −3 GeV with a relative uncertainty of +4.0% −3.9% [91].…”

“…For the version of the FSS model discussed here, we perform a comprehensive phenomenological analysis involving the h → γγ decay, where h is the SM Higgs boson. The signal strength of the Higgs in the diphoton decay channel, R γγ , is measured at the LHC, the value of which is around one [82].…”