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We study tree level scattering amplitudes of four massless states in thedouble scaled little string theory, and compare them to perturbative loopamplitudes in six-dimensional super-Yang-Mills theory. The little stringamplitudes are computed from correlators in the cigar coset CFT and in N=2minimal models. The results are expressed in terms of integrals of conformalblocks and evaluated numerically in the alpha' expansion. We find strikingagreements with up to 2-loop scattering amplitudes of massless gluons in 6DSU(k) SYM at a Z_k invariant point on the Coulomb branch. We comment on theissue of UV divergence at higher loop orders in the gauge theory and discussthe implication of our results.

Little String Amplitudes (and the Unreasonable Effectiveness of 6D SYM)