An Analysis of the Time-Dependent CP Asymmetry in $B\to \pi \pi$ Decays in the Standard Model

A. Ali, E. Lunghi, A. Ya. Parkhomenko

Measurements of the time-dependent CP asymmetry in the decay $B_d^0(t)\to {\pi }^{+}{\pi }^{-}$ and its charge conjugate by the BELLE and BABAR collaborations currently yield $C_{ππ}^{+-} = -…