The contribution of a Kβ(1430)0+ resonance to D0βKβΟ+ is
calculated by applying the soft pion theorem to D+βKβΟ+, and is
found to be about 30% of the measured amplitude and to be larger than the
ΞI=3/2 component of this amplitude. We estimate a 70% contribution to
the total amplitude from a higher Kβ(1950) resonance. This implies large
deviations from factorization in D decay amplitudes, a lifetime difference
between D^0 and D^+, and an enhancement of D0βDΛ0 mixing due to SU(3)
breaking.Comment: To be published in Physical Review Letters, some corrections,
references update