Mixing angles of ΞQ−ΞQ′ in heavy quark effective theory

The Heavy Quark Effective Theory provides a systematic method to estimate mixing angle of hadron states in heavy quark, such as the charm quark (c) and bottom (b). By using this method, baryons $\varXi_Q-\varXi_Q'$ can be estimated. It is found that between $\varXi_Q$ $\varXi_Q'$ given by $\theta_b = 4.51^{\circ} \pm 0.79 ^{\circ}$ for $Q b$ case $\theta_c 8.12^{\circ} 0.80 c$ case.