  We consider the possibility of studying the CP properties of various B(s)
decays at an electro-positron machine tuned to the Upsilon(5s). Since decay
modes of the B(s) with definite CP are relatively rare, we suggest that the use
of more common modes which are not pure CP eigenstates may allow the
determination of the CKM phase gamma. By studying the degree of correlation
between different decay modes at a Upsilon(5s) it is possible to determine the
degree of affinity of each decay mode to a CP eigenstate. Once this is known,
the correlation between a decay mode with a greater affinity to a particular CP
eigenstate with a mode such as D(s) + K- gives a determination of the phase
gamma.
