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Mixing angles are used to describe the $SU(6)\otimes O(3)$ symmetry breakingin $\left[70,~1^-\right]$ multiplet in the sector of the lowest mass nucleonresonances, which are investigated extensively in constituent quark models forbaryon spectroscopy. The transition amplitudes for the meson photoproductionoff nucleon can also be expressed in terms of the mixing angles to take intoaccount the configuration mixing. Those amplitudes are derived as a function ofthe mixing angles between $|N^2P_M{J}^-\rangle$ and $|N^4P_M{J}^-\rangle$states, with $J$=1/2 and 3/2, for the processes $\gamma p \to \eta p,~K^+\Lambda,~K^+ \Sigma^\circ,~K^\circ \Sigma^+$. The present status of ourknowledge on the mixing angles between $S_{11}(1535)$ and $S_{11}(1650)$($\theta _{S}$), as well as between $D_{13}(1520)$ and $D_{13} (1700)$ ($\theta_{D}$) is reported. Since these resonances play very important role in thethreshold region for both $\eta$ and kaon production mechanisms, they areexpected to provide crucial tests of different quark models for the baryonspectroscopy.

Configuration Mixing of Quark States in Baryons