', \zeta)
- 4 N_f T_F \frac{( x - x' )}{x'( x' - \zeta )}
\Theta_{111}^0 ( x , x - \zeta, x - x ' ). \nonumber\end{aligned}$$ These expressions coincide with the ones obtained in Ref. [@JiOs97] provided we have made some obvious redefinition of their conventions. Taking the limit intrinsic to the exclusive kinematics we obtain the well know result [@Cha81; @Bra83] for the radiative corrections to the coefficient functions of the parity-even vector meson transition form factor.

Renormalon chains in the non-singlet evolution kernel.
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The last issue of this paper that can be studied by the presently developed methods is the renormalon chains resummation of the ER-BL evolution kernel. Recently, this problem has been considered in the ${\overline{\rm MS}}$ scheme for the non-singlet channel [@Mik97; @GosKiv97] (see also the work for the DGLAP splitting kernels [@Gra97; @Mankiewicz97]). It has been found that the resulting series possesses a nonzero convergent radius, so that the infrared renormalons are absent in the kernels. From our point of view this result can be achieved by a partial resummation of conformal anomalies. The $\hat{B}$-matrix defined in Eq. (\[blefdt-1\]) diagonalizes the anomalous dimension matrix for the case $\beta=0$. From the conformal constraints 