Figure 1
Measuring the parameters of the unitarity triangle (top) is important for understanding matter-antimatter asymmetry. In a recent fit for the apex (bottom), the contours show the 68, 95, 99 and 99.9% confidence level regions. The red lines are constraints coming from measured parameters, and the pink and blue bands correspond to the direct measurement of the angle Β from the B-factories (at 68 and 95% confidence).