The parameters ${{\mathit r}}_{{{\mathit B}^{0}}}$ and ${{\mathit \delta}}_{{{\mathit B}^{0}}}$ are the magnitude ratio and strong phase difference between the amplitudes of A(${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit D}^{0}}{{\mathit K}^{*0}}$) and A(${{\mathit B}^{0}}$ $\rightarrow$ ${{\overline{\mathit D}}^{0}}{{\mathit K}^{*0}}$). The measured observables and are defined as ${{\mathit x}}_{\pm{}}$ = ${{\mathit r}}_{{{\mathit B}^{0}}}$ cos(${{\mathit \delta}}_{{{\mathit B}^{0}}}$ $\pm{}{{\mathit \gamma}}$) and ${{\mathit y}}_{\pm{}}$ = ${{\mathit r}}_{{{\mathit B}^{0}}}$ sin(${{\mathit \delta}}_{{{\mathit B}^{0}}}$ $\pm{}{{\mathit \gamma}}$) where ${{\mathit \gamma}}$ is the CKM angle ${{\mathit \gamma}}$.
"OUR EVALUATION" is provided by the Heavy Flavor Averaging Group (HFLAV). The CKM angle $\gamma $ is listed in the ${{\mathit B}^{+}}$ section for "$\mathit CP$ VIOLATION PARAMETERS IN ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit D}}{{\mathit K}^{+}}$ AND SIMILAR DECAYS."