Scientists working on the ATLAS and CMS experiments at CERN announced the observation of a new particle with a mass of about 125 gigaelectronvolts, consistent with the Higgs boson predicted in 1964.
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The particle is associated with the field that gives mass to elementary particles, completing the standard model of particle physics. Both experiments reported results at the five-sigma level of statistical significance, the conventional threshold for a discovery.
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Peter Higgs and François Englert, who developed the theory, were awarded the Nobel Prize in Physics the following year.
