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CERN Courier magazine: May 2017 digital edition

Cern Courier

Welcome to the digital edition of the May 2017 issue of CERN Courier

The first meeting at which the Large Hadron Collider (LHC) was officially discussed took place in March 1984, almost a quarter of a century before the first beams circulated in the machine. Following the outcome of the 2013 European Strategy for Particle Physics, CERN launched a Future Circular Collider (FCC) project to help assess what tool should come next after the LHC to continue its journey to the heart of matter. The FCC, which is among a handful of other high-energy colliders currently under consideration, envisages a 100 km-circumference tunnel in which three different collider modes could be realised: an e+e collider that would improve by orders of magnitude the measurement precision on the Higgs boson and other Standard Model particles; an electron–proton collider that would probe the proton’s substructure with unmatchable precision; and a 100 TeV proton–proton collider with a discovery potential more than five times greater than the LHC. This month’s cover feature describes the enormous physics potential of such a facility, in particular its ability to measure in detail the properties of the Higgs boson. We also describe the history of dark matter, the search for which is another key goal of the LHC and future colliders, and describe how ESA’s Euclid probe will unearth the true nature of the “dark energy” that is driving the accelerating expansion of the universe. Sticking with the darkness theme, we interview theorist Erik Verlinde, who argues that dark matter is not real.

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