Once a particle of matter, always a particle of matter. Or not. Thanks to a quirk of quantum physics, four known particles made up of two different quarks--such as the electrically neutral D meson composed of a charm quark and an up antiquark--can spontaneously oscillate into their antimatter partners and vice versa.
Once a particle of matter, always a particle of matter. Or not. Thanks to a quirk of quantum physics, four known particles made up of two different quarks--such as the electrically neutral D meson composed of a charm quark and an up antiquark--can spontaneously oscillate into their antimatter partners and vice versa.
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