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CERN Courier magazine: December 2016 digital edition

Cern Courier

Welcome to the digital edition of the December 2016 issue of CERN Courier

Ever since the discovery of the positron in 1932, physicists have undertaken countless experiments to look for differences in the behaviour of antimatter versus matter. CERN has played a vital role in this effort: in 1995 it created the first atoms of antihydrogen, followed by more complex antiprotonic helium. In the pursuit of ever more precise antimatter studies, CERN has completed a major upgrade to its Antiproton Decelerator facility. Called ELENA, the new synchrotron will make the difficult process of catching and trapping antiprotons much more efficient, allowing powerful tests of Lorentz and CPT symmetries. These concepts, which form the cornerstones of our modern understanding of space–time, have come under renewed scrutiny in recent years in the search for physics beyond the Standard Model. Antimatter is also being probed from space courtesy of the AMS experiment, in which CERN plays a critical role. This issue summarises the first five years of AMS data, which contain mysterious features in the cosmic-ray spectrum that have implications for dark matter. Taking things back to Earth, we also report on groundbreaking results from CERN’s CLOUD experiment that could increase the precision of climate predictions, and review what has been a record-breaking year for proton operations at the LHC.

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