CP violation studies in B⁰ → D^(*)±π^∓ in BaBar and Belle

Abstract

We present a preliminary measurement of the time-dependent CP asymmetries in decays of B⁰ mesons to the final states D^(*)π using data collected by the BaBar experiment at the PEP-II storage rings. B mesons decaying to Dπ are fully reconstructed, while events containing B → D^(*)π are selected using a full or a partial reconstruction technique. These results can be interpreted in terms of a constraint on the angles of the unitarity triangle to set a lower bound on $|\sin(2\beta+\gamma)|$. The Belle experiment at the KEK-B collider is performing the same kind of studies and a preliminary estimation of the achievable error is presented.