Natural Suppression of Strong $P$ - and $T$ -Invariance Violations and Calculable Mixing Angles in SU (2) ⊗ U (1)

Permutation symmetry is imposed on an

SU {(2)}_{L} \otimes U (1) \otimes CP

-invariant Lagrangian with six quarks. The mixing angles of the

b

and

t

are determined:

b

decays predominantly to

u

and a meson containing

b

should have a lifetime

τ_{B} \approx 10^{- 11}

sec or less. A phase in the gauge couplings of

b

and

t

causes nonconservation of

CP

K_{L}

decays that is naturally small. No violations of

P

and

T

invariance are induced into the strong interactions by

φ = \arg (Det M)

at the tree level. One-loop corrections yield an upper bound of

φ < 10^{- 10} (\frac{m_{s}}{m_{b}}) {(\frac{m_{t}}{m_{b}})}^{2}

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Natural Suppression of StrongP- andT-Invariance Violations and Calculable Mixing Angles in SU (2) ⊗ U (1)