We study two-body D ! PP decays, assuming that each decay process go through the bare amplitude followed by elastic SU(3) rescattering, where the bare amplitude consists of (i) the color-allowed and color-suppressed factorization amplitudes and (ii) the short-distance weak annihilation amplitudes. We have performed the 2 fit on 14 branching ratios of D ! PP decays in the formalism of the above mentioned model. The final state interactions can be well accounted for by the short-distance annihilation topologies and SU(3) rescatterings. The two SU(3) rescattering phase differences are 27 ÿ 8 ' ÿ46 and 27 ÿ 1 ' ÿ21 , where 27 ; 8 , and 1 are the rescattering phases of final states corresponding to the representations 27; 8, and 1, respectively. We find that the D 0 ! K 0 K 0 decay occurs mainly due to the nonzero short-distance weak annihilation effects, originating from SU(3) symmetry-breaking corrections to the distribution amplitudes of the final-state kaons, but receives tiny effects from other modes via SU(3) rescattering. Our results are in remarkable accordance with the current data.
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