Charmless hadronic B decays at BABAR

Abstract

Using 22.7M BBbar events collected with the BABAR detector at SLAC, we present preliminary measurements of the branching fractions for charmless hadronic decays of B mesons into two-body, quasi two-body and three-body final states with pions, kaons, and rho and a0 resonances. In the search for exclusive $B^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$, we measure $\mathcal{B}(B^0\to {\rho }^{\pm }(770){\pi }^{\mp })=(28.9\pm 5.4\pm 4.3)\times 10^{-6}$, together with the relative asymmetry ${\mathcal{A}}_{\mathrm{phys}}=-0.04\pm 0.18\pm 0.02$. We also set the upper limits on $B^0\to {\rho }^0(770){\pi }^0$, non-resonant $B^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$, $B^0\to a_0^{\pm }(\to \eta {\pi }^{\pm }){\pi }^{\mp }$ and $B^0\to K^0{\bar{K}}^0$.

6 pages, 4 postscript figures, submitted to EPS HEP 2001