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In this paper, we calculate the branching ratios and the direct CP-violatingasymmetries for decays $\bar{B}^0\to a^0_0(980)\pi^0, a^+_0(980)\pi^-,a^-_0(980)\pi^+$ and $B^-\to a^0_0(980)\pi^-, a^-_0(980)\pi^0$ by employing theperturbative QCD factorization approach. Although the light scalar meson$a_0(980)$ is widely perceived as primarily the four-quark bound states, thecalculation shows that the 2-quark model supposition for $a_0(980)$ can not beruled out by the currently available experiment upper limits. In theseconsidered decays, the branching ratio for the $B^-\to a^0_0(980)\pi^-$ is thelargest, $2.8\times 10^{-6}$, while its direct CP asymmetry is the smallest,$\sim 14%$. Although the direct CP asymmetries for the decays $\bar{B}^0\toa^0_0(980)\pi^0, B^-\to a^-_0(980)\pi^0$ are large, about $(70\thicksim80)%$,it is still difficult to measure them, since their branching ratios are small,around $(4\thicksim5)\times 10^{-7}$.

Study of scalar meson $a_0(980)$ from $B \to a_0(980)\pi$ Decays