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We derive the planar dilatation operator in the closed subsector of scalarcomposite operators of an N=2 superconformal quiver gauge theory to threeloops. By tuning the ratio of its two gauge couplings we interpolate between aZ_2 orbifold of N=4 SYM theory and N=2 superconformal QCD. We find zeta(3)contributions at three loops that disappear when the theory is at the orbifoldpoint. They are responsible for imaginary contributions to the dispersionrelation of a single scalar excitation in the spin-chain picture. This pointstowards an interpretation of the individual scalar excitations as effectiverather than as elementary magnons. We argue that the elementary excitationsshould be associated with certain fermions and covariant derivatives, and thatintegrability in the respective subsectors should persist at least to twoloops.

From N=4 gauge theory to N=2 conformal QCD: three-loop mixing of scalar composite operators