{\alpha _s}{8\pi }\,\frac{a}{f_a}\sum \Big [5\left( \Delta _{\psi }+\Delta _{\psi '}\right) +\left( \Delta _{\chi }+\Delta _{\chi '}\right) \Big ]\nonumber \\&\quad G^a_{\mu \nu }\tilde{G}^{a\mu \nu }+\nonumber \\&-\dfrac{\alpha _2}{8\pi }...