Measurements of the Higgs boson inclusive and differential fiducial cross-sections in the diphoton decay channel with pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

Abstract

A measurement of inclusive and differential fiducial cross-sections for the production of the Higgs boson decaying into two photons is performed using 139 fb−1 of proton-proton collision data recorded at $$ \sqrt{s} $$ s = 13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio, in a fiducial region closely matching the experimental selection, is measured to be 67 ± 6 fb, which is in agreement with the state-of-the-art Standard Model prediction of 64 ± 4 fb. Extrapolating this result to the full phase space and correcting for the branching ratio, the total cross-section for Higgs boson production is estimated to be 58 ± 6 pb. In addition, the cross-sections in four fiducial regions sensitive to various Higgs boson production modes and differential cross-sections as a function of either one or two of several observables are measured. All the measurements are found to be in agreement with the Standard Model predictions. The measured transverse momentum distribution of the Higgs boson is used as an indirect probe of the Yukawa coupling of the Higgs boson to the bottom and charm quarks. In addition, five differential cross-section measurements are used to constrain anomalous Higgs boson couplings to vector bosons in the Standard Model effective field theory framework.

Higgs EFT results at ATLAS and CMS

“…The differential unfolded measurement of H → γγ production rates [5] is performed as a function of 5 different observables: the di-photon system p T , the number of jets, the di-jet mass and angle distance in the transverse plane (∆Φ j j ), the leading-jet p T . Uncertainties are dominated by the limited number of available events and results are in agreement with the SM predictions.…”

Fiducial and differential cross-section measurements in the di-photon channel using full Run2 dataset at ATLAS

“…The measurements of Higgs boson properties in the → channel [5] benefit from the excellent mass resolution of the di-photon system and the low background contributions. The signature is based on selecting events with the leading and sub-leading photon candidate required to fulfill isolation criteria with the invariant mass in the range 105-160 GeV.…”

“…In comparison with the direct searches [6], comparable limits are set to while stronger limits are set on for shape+normalization scenario at 95% CL. T shape and (c) T shape + normalization informations [5].…”

“…Measurements of fiducial and differential cross sections are performed within a specific phase space (fiducial region) and provide a model independent measurement due to the minimal number of physical assumptions considered. In the following, an overview of the main results for the measurements of the fiducial and differential cross sections performed by ATLAS experiment using full Run 2 dataset at 139 fb −1 are shown for → decay channel [5]. In addition, the interpretation of the measurements are provided using the T shape information in order to indirectly constrain the charm-and bottom-quarks Yukawa couplings.…”

Higgs fiducial and differential measurements at ATLAS and CMS

“…Measurements such as the fiducial and differential crosssection which are performed within a specific phase space (fiducial region) and provide a model independent measurement due to the minimal number of physical assumptions considered. In the following, an overview of the main results for measurements of the fiducial and differential cross sections performed by both ATLAS and CMS experiments using LHC full Run2 dataset at 137-139 fb −1 are shown for Higgs decays in bosonic final states as [5], [6,7], [8,9] and fermionic states as [10] and ¯ [11,12]. In addition, a combination measurement [13] between and channels is performed in ATLAS by extrapolating the cross sections to the full phase space by applying inclusive and differential acceptance factors computed from SM predictions.…”