Higgs Boson Physics at ATLAS

The discovery of a new boson with the ATLAS detector at the LHC proton-proton collider is confirmed using the full data set collected at centre-of-mass energies of 7 and 8 TeV. The spin and parity properties of the boson are consistent with that of a scalar particle with positive parity. Comparison of the JP = 0+ hypothesis to alternatives JP = 0−, 1+, 1−, 2+ result in exclusion of these other choices at 97.8%, 99.97%, 99.7%, and 99.3% CL. The Higgs boson mass is . Evidence for production of the Higgs boson by vector boson fusion is obtained in a model-independent approach by comparing the signal strengths μ of vector boson fusion and production associated with a vector boson to that for gluon fusion including associated production of top quark pairs: which is 3.3 Gaussian standard deviations from zero.