Measurement of CP violation parameters in b quark decays to charm anticharm down quarks, exclusive decays at the BaBar experiment

Abstract

The BABAR experiment at SLAC provides an opportunity for measurement of CP violation in B decays. A measurement of time-dependent CP violating asymmetries using exclusive B meson decays where the b quark decays to cc¯d (including B⁰ → D*⁺ D*⁻ and B⁰ → D*^±D^∓ decays) is presented here. This is the first measurement of CP violation in a mode sensitive to the Unitarity Triangle parameter sin2β outside of decays containing charmonium. It provides a comparison to measurements of sin2β using b → cc¯s, and permits an observation into potential new physics sources of CP violation, such as supersymmetry, via differences between these measurements and those of [special characters omitted] as statistics of reconstructed neutral B decays to D^(*)+D^(*)− increase. The measured value of the time-dependent CP violating asymmetries are: [special characters omitted]for B⁰ → D* ⁻D⁺, [special characters omitted]for B⁰ → D* ⁺D⁻, and [special characters omitted]for B⁰ → D* ⁺D*⁻, where S corresponds to CP violation in the interference of mixing and decay and C corresponds to CP violation in decay.