Measurement of CP-violating parameters in fully reconstructed $B\to D^{(*)}π$ and $B\to Dρ$ decays

Abstract

We present a preliminary measurement of CP-violating asymmetries in fully reconstructed B0→D(∗)±π∓ and $\B^0{\to}D^{\pm}\rho^{\mp}$ decays in approximately 110 million Υ(4S)→BB¯ decays collected with the BaBar detector at the PEP-II asymmetric-energy B factory at SLAC. % From a maximum likelihood fit to the time-dependent decay distributions we obtain for the CP-violating parameters: aDπ=−0.032±0.031(stat.)±0.020(syst.),cDπlep=−0.059±0.055(stat.)±0.033(syst.) on the B0→D±π∓ sample, aD∗π=−0.049±0.031(stat.)±0.020(syst.),cD∗πlep=+0.044±0.054(stat.)±0.033(syst.) on the B0→D∗±π∓ sample, and aDρ=−0.005±0.044(stat.)±0.021(syst.),cDρlep=−0.147±0.074(stat.)±0.035(syst.) on the B0→D±ρ∓ sample.