Uncertainties on the CP Phase $\bfalpha$ due to Penguin Diagrams

R. Aleksan, F. Buccella, A. Le Yaouanc +3

A major problem in the determination of the the CP angle $\alpha$, that should be measured through modes of the type $B_d,{\bar{B}}_d\to \pi \pi ,\cdots ,$ is the uncertainty coming from Pen…