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We analyze the decays $B^0 \to a^\pm_0 \pi^\mp$ and $B^{-,0} \to f_0 K^{-,0}$and show that within the factorization approximation a phenomenologicalconsistent picture can be obtained. We show that in this approach the $O_6$operator provides the dominant contributions to the suppressed channel $B^0 \toa^+_0 \pi^-$. When the $a_0$ is considered a two quark state, evaluation of theannihilation form factor using Perturbative $QCD$ implies that thiscontribution is not negligible, and furthermore it can interfere constructivelyor destructively with other penguin contributions. As a consequence of thisambiguity, the positive identification of $B^0 \to \pi^+ a_0^-$ can notdistinguish between the two or four quark assignment of the $a_0$. According toour calculation, a best candidate to distinguish the nature of $a_0$ scalar is$Br(B^-\to \pi^0a_0^-)$ since the predictions for a four quark model is oneorder of magnitude smaller than for the two quark assignment. When the scalarsare seen as two quarks states, simple theoretical assumptions based on SU(2)isospin symmetry provide relations between different B decays involving onescalar and one pseudoscalar meson.Comment: 12 pages, 3 figure

Annihilation contribution and B → a 0π, f 0 K decays