A precise determination of $\alpha$ using $B^0\to {\rho }^{+}{\rho }^{-}$ and $B^{+}\to K^{\ast 0}{\rho }^{+}$

Martin Beneke, Michael Gronau, Johannes Rohrer +1

The effect of the penguin amplitude on extracting $\alpha$ from CP asymmetries in $B^0\to {\rho }^{+}{\rho }^{-}$ decays is studied using information on the SU(3)-related penguin amplitude in $B^+\to K…