Determining weak phases using B->D^*V Decays

Abstract

We describe how the angular analysis of vector-vector final states in B decays provides theoretically clean techniques for determination of CP violating phases. The quantity $\sin^2 (2\beta + \gamma)$ can be cleanly obtained from the time dependent study of decays such as B_d(t)->D^{*\pm} \rho^\mp, D^{*\pm} a_1^{\mp} etc. Similarly, one can use B_s(t)-> D_s^{*\pm} K^{*\mp} to extract $\sin^2 \gamma$. A time independent study of the charged decay mode B^\pm-> D^{*0}(\bar D^{*0}) K^{*\pm} can also be used to extract gamma.