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arXiv:hep-th/0506114International audienceWe propose a new multiple-integral representation for the correlation function [sigma(1)(z)sigma(m+1)(z)] of the XXZ spin-1/2 Heisenberg chain in the disordered regime. We show that for Delta = 1/2 the integrals can be separated and computed exactly. As an example we give the explicit results up to the lattice distance m = 8. It turns out that the answer is given as integer numbers divided by 2((m+1)2)

Exact results for the σztwo-point function of theXXZchain at Δ = 1/2

Exact results for the σ^ztwo-point function of theXXZchain at Δ = 1/2