Space-like Penguin effects in $B_c$ decays

Abstract

The space-like penguin contributions to branching ratios and CP asymmetries in charmless decays of $B_c$ to two pseudoscalar mesons are studied using the next-to-leading order low energy effective Hamiltonian and factorization approximation. Both the gluonic penguin and the electroweak penguin diagrams are considered. In addition the annihilation diagram contributions are also taken in account. We find that the space-like penguin effects are significant.