Multi-instanton calculus versus exact results in N = 2 supersymmetric QCD Original Research Article

Microscopic tests of the exact results are performed in N = 2 supersymmetric SU(2) QCD. We present the complete construction of the multi-instanton in N = 2 supersymmetric QCD. All the defining equations of the super instanton are reduced to the algebraic equations. Using this result, we calculate the two-instanton contribution F2 to the prepotential F for the arbitrary Nƒ theories. For Nƒ = 0, 1, 2, instanton calculus agrees with the prediction of the exact results, however, for Nƒ = 3, 4, we find discrepancies between them. We propose improved curves of the exact results for the massive Nƒ = 3 and massless Nƒ = 4 theories.