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News and Views
Nature 399, 200-203 (20 May 1999) | doi:10.1038/20306
Particle physics: Only a matter of time
Ken Peach1
A steady stream of new results1, 2, 3, 4 over the past six months has illuminated an obscure but important corner of the quantum world, which could have profound implications for our understanding of the origin of the material universe. These experiments search for small asymmetries in particle properties associated with the behaviour of quantum-mechanical systems under the reversal of time, or, equivalently, the combined operation of charge conjugation (interchange of matter and antimatter) and parity (reflection of space through the origin).
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