The generalised scaling function: a note

Details The generalised scaling function: a note The generalised scaling function: a note

2008-05-28

arxiv.org/abs/0805.4407v2

Nucl.Phys.B827:359-380,2010

Physics

High Energy Physics

High Energy Physics - Theory

Latex version, typos corrected, references and clarifications added

Scientific paper

10.1016/j.nuclphysb.2009.10.007

A method for determining the generalised scaling function(s) arising in the high spin behaviour of long operator anomalous dimensions in the planar $sl(2)$ sector of ${\cal N}=4$ SYM is proposed. The all-order perturbative expansion around the strong coupling is detailed for the prototypical third and fourth scaling functions, showing the emergence of the O(6) Non-Linear Sigma Model mass-gap from different SYM 'mass' functions. Remarkably, only the fourth one gains contribution from the non-BES reducible densities and also shows up, as first, NLSM interaction and specific model dependence. Finally, the computation of the $n$-th generalised function is sketched and might be easily finalised for checks versus the computations in the sigma model or the complete string theory.

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