At most one renormalization scheme can keep the leading term of the large-Nf beta function dominant, so truncated large-Nf predictions of ultraviolet fixed points are not scheme-robust.
Towards the QED beta function and renormalons at $1/N_f^2$ and $1/N_f^3$
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We determine the $1/N_f^2$ and $1/N_f^3$ contributions to the QED beta function stemming from the closed set of nested diagrams. At order $1/N_f^2$ we discover a new logarithmic branch-cut closer to the origin when compared to the $1/N_f$ results. The same singularity location appears at $1/N_f^3$, and these correspond to a UV renormalon singularity in the finite part of the photon two-point function.
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Probing Large $N_f$ Through Schemes
At most one renormalization scheme can keep the leading term of the large-Nf beta function dominant, so truncated large-Nf predictions of ultraviolet fixed points are not scheme-robust.