Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
Abstract
A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb-1 collected at √{ s} = 7 TeV in 2011 and 5.8 fb-1 at √{ s} = 8 TeV in 2012. Individual searches in the channels H → ZZ (*) → 4 ℓ, H → γγ and H → WW (*) → eνμν in the 8 TeV data are combined with previously published results of searches for H → ZZ (*), WW (*), bbbar and τ+τ- in the 7 TeV data and results from improved analyses of the H → ZZ (*) → 4 ℓ and H → γγ channels in the 7 TeV data. Clear evidence for the production of a neutral boson with a measured mass of 126.0 ± 0.4 (stat) ± 0.4 (sys) GeV is presented. This observation, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of 1.7 ×10-9, is compatible with the production and decay of the Standard Model Higgs boson.
- Publication:
-
Physics Letters B
- Pub Date:
- September 2012
- DOI:
- 10.1016/j.physletb.2012.08.020
- arXiv:
- arXiv:1207.7214
- Bibcode:
- 2012PhLB..716....1A
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 24 pages plus author list (38 pages total), 12 figures, 7 tables, revised author list, matches version to appear in Physics Letters B