Abstract
Properties of the Higgs boson are measured in the two-photon final state using 36.1 fb$^{-1}$ of proton-proton collision data recorded at $\sqrt{s} = 13$ TeV by the ATLAS experiment at the Large Hadron Collider. Cross-section measurements for the production of a Higgs boson through gluon-gluon fusion, vector-boson fusion, and in association with a vector bosonor a top-quark pair are reported. The signal strength, defined as the ratio of the observed to the expected signal yield, is measured for each of these production processes as well as inclusively. The global signal strength measurement of $0.99 \pm 0.14$ improves on the precision of the ATLAS measurement at $\sqrt{s} = 7$ and 8 TeV by a factor of two. Measurements of gluon-gluon fusion and vector-boson fusion productions yield signal strengths compatible with the Standard Model prediction. Measurements of simplified template cross sections, designed to quantify the different Higgs boson production processes in specific regions of phase space, are reported. The cross section for the production of the Higgs boson decaying to two isolated photons in a fiducial region closely matching the experimental selection of the photons is measured to be $55 \pm 10$ fb, which is in good agreement with the Standard Model prediction of $64 \pm 2$ fb. Furthermore, cross sections in fiducial regions enriched in Higgs boson production in vector-boson fusion or in association with large missing transverse momentum, leptons or top-quark pairs are reported. Differential and double-differential measurements are performed for several variables related to the diphoton kinematics as well as the kinematics and multiplicity of the jets produced in association with a Higgs boson. No significant deviations from a wide array of Standard Model predictions are observed.
Highlights
In July 2012, the ATLAS [1] and CMS [2] experiments announced the discovery of a Higgs boson [3,4] using protopn–ffiffiproton collisions collected at center-of-mass energies s 1⁄4 7 TeV and 8 TeV at the CERN Large Hadron
The increased center-ofmass energy results in much larger cross sections for events at high partonic center-of-mass energy. This implies improved sensitivity to a variety of interesting physics processes, such as Higgs bosons produced at high transverse momentum or Higgs bosons produced in association with a top–antitop quark pair
Cross sections times branching ratio of the Higgs to two photons BðH → γγÞ are measured for inclusive Higgs boson production, as well as for several individual production processes: gluon–gluon fusion, vector-boson fusion (VBF), Higgs boson production in association with a vector boson (VH), and production of a Higgs boson in association with a top–antitop quark pair or a single top quark (t-channel and W-associated, respectively denoted as tHq and tHW, or in their sum as “tH”)
Summary
In July 2012, the ATLAS [1] and CMS [2] experiments announced the discovery of a Higgs boson [3,4] using protopn–ffiffiproton collisions collected at center-of-mass energies s 1⁄4 7 TeV and 8 TeV at the CERN Large Hadron. The increased center-ofmass energy results in much larger cross sections for events at high partonic center-of-mass energy. This implies improved sensitivity to a variety of interesting physics processes, such as Higgs bosons produced at high transverse momentum or Higgs bosons produced in association with a top–antitop quark pair. The results of measurements of the Higgs boson properties in the diphoton decay channel are prepseffinffited using 36.1 fb−1 of pp collision data collected at s 1⁄4 13 TeV by the ATLAS detector in 2015 and 2016.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
