On the logarithmic powers of $sl(2)$ SYM$_4$

In the high spin limit the minimal anomalous dimension of (fixed) twist operators in the $sl(2)$ sector of planar ${\cal N}=4$ Super Yang-Mills theory expands as $γ(g,s,L)=f(g) \ln s + f_{sl}(g,L) + \sum \limits_{n=1}^\infty γ^{(n)}(g,L) (\ln s)^{-n} + ...$. We find that the sub-logarithmic contribution $γ^{(n)}(g,L)$ is governed by a linear integral equation, depending on the solution of the linear integral equations appearing at the steps $n'\leq n-3$. We work out this recursive procedure and determine explicitly $γ^{(n)}(g,L)$ (in particular $γ^{(1)}(g,L)=0$ and $γ^{(n)}(g,2)=γ^{(n)}(g,3)=0$). Furthermore, we connect the $γ^{(n)}(g,L)$ (for finite $L$) to the generalised scaling functions, $f^{(r)}_n(g)$, appearing in the limit of large twist $L\sim\ln s$. Finally, we provide the first orders of weak and strong coupling for the first $γ^{(n)}(g,L)$ (and hence $f^{(r)}_n(g)$).

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