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The exact amplitude for the asymptotic correlation function in the S=1/2Heisenberg antiferromagnetic chain is determined: <S^a_0 S^b_r> goes to (-1)^rdelta^{ab}(ln r)^{1/2}/[(2 pi)^{3/2}r]. The behaviour of the correlationfunctions for small xxz anisotropy and the form of finite-size corrections tothe correlation function are also analysed.Comment: 8 pages, 3 figures, added reference and discussio

Exact correlation amplitude for the Heisenberg antiferromagnetic chain