Deep inelastic and dipole scattering on finite length hot $\mathcal{N}=4$ SYM matter

Details Deep inelastic and dipole scattering on finite length hot $\mathcal{N}=4$ SYM matter Deep inelastic and dipole scattering on finite length hot $\mathcal{N}=4$ SYM matter

2008-12-15

arxiv.org/abs/0812.2897v1

Nucl.Phys.A822:20-40,2009

Physics

High Energy Physics

High Energy Physics - Theory

26 pages

Scientific paper

10.1016/j.nuclphysa.2009.03.002

Deep inelastic scattering of $\mathcal{R}$-currents and the scattering of a small dipole on finite length hot $\mathcal{N}=4$ SYM matter are discussed. In each case we find the scale when scattering becomes strong is determined by a saturation momentum $Q^2_s \sim LT^3/x$ where $L$ is the length of the matter. For $\mathcal{R}$-currents we analyze the operator product expansion. For infinite length matter the series generated by the OPE is not Borel summable but we are able to determine the exponential part of the tunneling amplitude determining $F_2$ when $\frac{Q^2}{Q^2_s}\gg 1$ from the position of the singularity closest to the origin on the real axis of the Borel plane. In finite length matter the OPE series is not convergent but it is Borel summable. When a small dipole, and the string connecting the ends of the dipole, pass through hot matter there is an induced motion of the string in the $5^{th}$ dimension. When $T^4 L \cosh \eta$, with the $\eta$ the rapidity of the string, is large enough the string would normally break into several parts after leaving the medium, however, this cannot happen in the classical approximation in which we work.

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