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CERN Courier magazine: May 2013 digital edition

Cern Courier

Welcome to the digital edition of the May 2013 issue of CERN Courier.

Last July, the ATLAS and CMS collaborations announced the discovery of a new particle at the LHC with a mass of 125 GeV. They referred to it as a “Higgs-like boson” because further data were needed to pin down more of its properties. Now, the collaborations have amassed enough evidence to identify the new particle as a Higgs boson, although the question remains of whether it is precisely the Higgs boson of the Standard Model of particle physics. The discovery brings the final touches to a picture that came into focus 30 years ago, when experiments at CERN first observed the W and Z bosons. The masses of these particles were just as electroweak theory predicted, based on their interactions with a hypothesized Higgs field and its boson. Meanwhile, other particle interactions continue to provide puzzles in more complex systems, from relatively simple nuclei to the hot, dense fireball created in heavy-ion collisions.

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