Abstract
The charge neutrality of the antimatter atom antihydrogen has been confirmed with unprecedented accuracy, paving the way for experiments that could simultaneously solve several of physics' biggest mysteries. See Letter p.373 One of the most puzzling current questions in physics is why we see so much more matter than antimatter in the Universe. Studying the properties of antimatter might give hints about the reasons for this imbalance. According to the Standard Model of particle physics, the charge of antihydrogen should be neutral, but it is challenging to test this experimentally as it is difficult to produce antimatter and to measure its properties. Now a team from the ALPHA collaboration at CERN has measured the charge of antihydrogen, confirming charge neutrality to a precision of a factor of 20 greater than that achieved previously. As the charge of the antiproton is known to similar precision, this result also delivers an improved limit on the positron charge anomaly.
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