Cabibbo theory

Cabibbo theory [ka′bi·bō ‚thē·ə·rē]

(particle physics)

A theory describing baryon beta-decay processes, according to which the amplitude for such processes is given byG{cos Θ[V(Δs= 0) +A(Δs= 0)] + sin Θ{V(Δs= +1) +A(Δs= +1)]{, where Θ is the Cabibbo angle, Δsis the change in strangeness for the baryon,Gis a universal beta-decay amplitude, andVandAare vector and axial vector amplitudes, respectively; it is experimentally determined that sin Θ ≈ 0.25, so that cos Θ = 0.97.