Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at $\sqrt{s}=8$ TeV with ATLAS

Abstract

Measurements of fiducial and differential cross sections are presented for Higgs boson production in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=8$ TeV. The analysis is performed in the $H\to \gamma \gamma$ decay channel using 20.3 fb${}^{-1}$ of data recorded by the ATLAS experiment at the CERN Large Hadron Collider. The signal is extracted using a fit to the diphoton invariant mass spectrum assuming that the width of the resonance is much smaller than the experimental resolution. The signal yields are corrected for the effects of detector inefficiency and resolution. The $pp\to H\to \gamma \gamma$ fiducial cross section is measured to be $43.2\pm 9.4(stat){}_{-2.9}^{+3.2}(syst)\pm 1.2(lumi)$ fb for a Higgs boson of mass 125.4 GeV decaying to two isolated photons that have transverse momentum greater than 35% and 25% of the diphoton invariant mass and each with absolute pseudorapidity less than 2.37. Four additional fiducial cross sections and two cross-section limits are presented in phase space regions that test the theoretical modelling of different Higgs boson production mechanisms, or are sensitive to physics beyond the Standard Model. Differential cross sections are also presented, as a function of variables related to the diphoton kinematics and the jet activity produced in the Higgs boson events. The observed spectra are statistically limited but broadly in line with the theoretical expectations.

3 pages plus cover page plus author list (67 pages total), 13 figures, 10 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-10/

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Cited by in corpus (10)

• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Resummation of Transverse Momentum Distributions in Distribution Space
• Rapidity-Dependent Jet Vetoes
• Measurements of top-quark pair to $Z$-boson cross-section ratios at $\sqrt{s}=13,8,7$TeV with the ATLAS detector
• Determination of spin and parity of the Higgs boson in the $W{W}^{\ast }\to e\nu \mu \nu$ decay channel with the ATLAS detector
• Kinematical correlations for Higgs boson plus High Pt Jet Production at Hadron Colliders
• Searching for degenerate Higgs bosons - A profile likelihood ratio method to test for mass-degenerate states in the presence of incomplete data and uncertainties
• Finite quark-mass effects in the NNLOPS POWHEG+MiNLO Higgs generator
• Four photon production at the LHC: an application of 2->4 analytic unitarity