ATLAS news release
On 31 July, 2012, the ATLAS experiment submitted a scientific paper describing the discovery of a new particle consistent with the Higgs Boson to the journal Physics Letters B. The CMS collaboration also submitted a paper to the same journal about their Higgs results.
The ATLAS paper gives the details of the analyses behind the results presented at the 4 July CERN announcement and the ICHEP conference, and also includes analysis of the H->WW channel with the 2012 data. The significance of observation is thus increased to 5.9 sigma. The mass of the new particle is measured as 126.0 ±0.4±0.4 GeV.
ATLAS concentrated its efforts with the early 2012 data on three complementary decay channels which are each described in the extended letter, with the Higgs decaying to two photons, or to four leptons, or to two leptons with missing energy. The combined result incorporates information from the earlier 2011 data analyses and establishes the discovery of a new fundamental particle.
The papers on ArXiv:
CMS: Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
Link to the news article on the ATLAS homepage.
CERN experiments observe particle consistent with long-sought Higgs boson – Nikhef press release with links to CERN press release of July 4th, with more information about Nikhef’s contribution to the research at ATLAS (Dutch).