Cabibbo’s theoretical ideas lead to the realization that quarks of a definite mass do not necessarily have definite flavor, that is, up, down, strange, etc. Rather, they can be mixtures of different flavors. Cabibbo’s insight explains why certain particle decays are suppressed, and it introduces the now-ubiquitous notion of mixing to particle physics.
About Nicola Cabibbo:
About 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.
