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Cabibbo angle

The Cabibbo angle is a measure of the probability that one flavor of quark (either down or strange) will change into another flavor (up) under the action of the weak force. The Cabibbo angle is named after the Italian physicist Nicola Cabibbo who introduced it in 1963.1


  1. Cabibbo, N., "Unitary Symmetry and Leptonic Decays," Physical Review Letters, 10 (12), 531533 (1963).

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