Penguin contributions to CP phases in $B_{d,s}$ decays to charmonium

Philipp Frings, Ulrich Nierste, Martin Wiebusch

The precision of the CP phases $2\beta$ and $2{\beta }_s$ determined from the mixing-induced CP asymmetries in $B_d\to J/\psi K_S$ and $B_s\to J/\psi \varphi$, respectively, is limited by the unknown long-…