Reducing the experimental uncertainty on the CKM angle alpha

We investigate possible strategies to reduce the experimental uncertainty o n the CKM angle alpha, in the working conditions of an asymmetric e(+)e(-) B-factory. We propose to use information from the time-dependent asymmetry of neutral B-decays to pi(+)pi(-), together with the ratio Gamma(<(B-0)over bar> --> pi(+)K(-))/Gamma(<(B-0)over bar> --> pi(+)pi(-)). We also conside r the possibility of using information on the ratio Gamma(<(B-0)over bar> - -> pi(+)pi(-))/Gamma(<(B-0)over bar> --> pi(+)pi(-)). An error analysis on alpha depending on the expected experimental uncertainties on the input qua ntities is carried out.