Nature must treat matter and antimatter differently, otherwise the early Universe would have created both in equal amounts. However, most particles obey “CP symmetry,” which states that the laws of physics are the same if a particle is swapped with a mirror reflection of its antiparticle. Quarks violate this symmetry but not by enough to explain matter’s dominance over antimatter. Now, researchers with the T2K Collaboration report with improved statistical confidence that CP symmetry is violated in neutrinos.
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