  The CP asymmetry predicted by the Standard Model in the decay modes Bs;d ->
J/psi eta and Bs -> J/psi phi is very small, and the observation of a sizeable
e ect would be a clear indication of new physics beyond the Standard Model.
Contrary to the final state J/psi phi, the former final state is a CP
eigenstate, and therefore complex angular distribution analyses are not
necessary for the asymmetry measurement. In this paper, the approaches for the
study of these two decay channels are presented.
