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Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service .Higgs boson research. Graphic of a candidate Higgs boson decay event detected at CERN in October 2017. This event, thought to be a Higgs boson decaying to two b-quarks, was recorded with the ATLAS (A Toroidal LHC Apparatus) detector on 5 October 2017. Electrons are shown as blue tracks with a large energy deposit in the electromagnetic calorimeter, corresponding to light green bars. Two of them form an invariant mass compatible with a Z boson. The two central b-tagged jets are represented by light blue cones. They contain the green and yellow bars corresponding to the energy deposition in the electromagnetic and hadronic calorimeters respectively. In the Standard Model, the Higgs boson is used to explain why particles have mass. CERN (the European particle physics laboratory) announced the Higgs boson discovery on 4 July 2012. (KEYSTONE/SCIENCE PHOTO LIBRARY/ATLAS Collaboration/CERN/SCIENCE PHOTO LIBRARY)