Abstract:

BaBar has already precisely measured the angle of the unitarity triangle. The two other angles are much more challenging, both from an experimental and a theoretical point of view. I will describe the first steps towards the measurement of the angle with the mode . We have performed a two-body time-dependent analysis of this mode, as well as the mode, and have measured CP-violating and CP-conserving parameters related to .( shift due to penguin contributions.) I will describe future paths to go from to .