Measurement of $B^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ Decays and Search for $B^0\to {\rho }^0{\rho }^0$

The Belle Collaboration, C. -C. Chiang

We report on a search for the decay $B^0\to {\rho }^0{\rho }^0$ and other charmless modes with a ${\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ final state, including $B^0\to {\rho }^0{\pi }^{+}{\pi }^{-}$, non-resonant $B^0\to 4{\pi }^{\pm }$, $B^0\to…