HFAG: B to Charm Decay Parameters
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Averages of experimental results on branching ratios (and other properties) of b hadron decays to charm hadrons

The symbol \(\mathcal{B}\) is used for branching ratios, \(f\) for production fractions, and \(\sigma\) for cross sections. The decay amplitudes for longitudinal, parallel, and perpendicular transverse polarization in pseudoscalar to vector-vector decays are denoted \({\cal{A}}_0\), \({\cal{A}}_\parallel\), and \({\cal{A}}_\perp\), respectively, and the definitions \(\delta_\parallel = \arg({\cal{A}}_\parallel/{\cal{A}}_0)\) and \(\delta_\perp = \arg({\cal{A}}_\perp/{\cal{A}}_0)\) are used for their relative phases. The inclusion of charge conjugate modes is always implied.
The old BtoCharm web site can be found here.