Formula_9120

\[\begin{gathered}\left.A(x) B(0)\right|_{x^{2} \rightarrow 0, x \sim 1 / m}= \\=\sum_{n, \mathbf{k}=1}^{\infty} C_{n}^{\mathbf{k}}\left(-x^{2}\right) x_{\mu_{1}} x_{\mu_{2}} \ldots x_{\mu_{n}} O_{\mu_{1} \mu_{2} \ldots \mu_{n}}^{\mathbf{k}}(0),\end{gathered}\]