CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2013-012
Title	Measurements of the properties of the Higgs-like boson in the two photon decay channel with the ATLAS detector using 25 $\mathrm{fb}^{-1}$ of proton-proton collision data
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2013
Imprint	06 Mar 2013
Number of pages	34
Note	All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2013-012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	CERN LHC ; ATLAS ; HIGGS
Abstract	Measurements of the mass and couplings of the Higgs-like boson in the two photon decay channel with the ATLAS detector at the LHC are presented. The proton-proton collision datasets used correspond to integrated luminosities of 4.8 $\mathrm{fb}^{-1}$ collected at $\sqrt{s}$ = 7 TeV and 20.7 $\mathrm{fb}^{-1}$ collected at $\sqrt{s}$ = 8 TeV. The updated measurements benefit from an increased data sample and an improved analysis. The measured value of the mass of the Higgs-like boson is $126.8 \pm 0.2 (\mathrm{stat}) \pm 0.7 (\mathrm{syst})$ GeV and the fitted number of signal events is found to be $1.65 \pm 0.24 (\mathrm{stat}) ^{+0.25}_{-0.18} (\mathrm{syst})$ times the value predicted by the Standard Model. Measurements of the signal strengths in different production processes and a fiducial cross section for the observed particle are also presented.
Copyright/License	Preprint: (License: CC-BY-4.0)

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