Higgs search at ATLAS

TL;DR

This paper reports the discovery and detailed measurements of the Higgs boson at ATLAS, confirming its properties align with the Standard Model predictions based on data from the LHC at 7 and 8 TeV.

Contribution

It provides the first observation of the Higgs boson at ATLAS and measures its mass, couplings, and quantum properties with high precision, confirming the Standard Model.

Findings

Higgs boson observed with mass 125.5 GeV

Measured couplings consistent with Standard Model

No evidence for additional Higgs states

Abstract

In this paper the results of Higgs searches at the ATLAS experiment, operating at the LHC, are summarised. The results are based on data samples corresponding to an integrated luminosity of up to 20.7 fb-1 at a centre-of-mass energy of 8 TeV and 4.6 fb-1 at 7 TeV. The observation of a Higgs boson is established. The mass of the new boson is measured to be 125.5 +/- 0.2 (stat) +0.5-0.6 (syst) GeV, and the ratio of the observed number of events and expected from a Standard Model Higgs Boson is compatible with unity, mu = 1.30 +/- 0.13 (stat) +/- 0.14 (sys). The spin and parity properties as well as the couplings structure are compatible with those predicted for a Standard Model Higgs Boson. No evidence of further Higgs states is found.