Wu Experiment
The Wu experiment was a particle and nuclear physics experiment conducted in 1956 by the Chinese American physicist Chien-Shiung Wu in collaboration with the Low Temperature Group of the US National Bureau of Standards. The experiment's purpose was to establish whether or not conservation of parity (''P''-conservation), which was previously established in the electromagnetic and strong interactions, also applied to weak interactions. If ''P''-conservation were true, a mirrored version of the world (where left is right and right is left) would behave as the mirror image of the current world. If ''P''-conservation were violated, then it would be possible to distinguish between a mirrored version of the world and the mirror image of the current world. The experiment established that conservation of parity was violated (''P''-violation) by the weak interaction, providing a way to operationally define left and right without reference to the human body. This result was not expected ...
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