Seiberg Conformal Window

A range of flavour number at which the N=1 supersymmetric QCD becomes a superconformal field theory . The exact Novikov-Shifman-Vainshtein-Zakharov beta function of the N=1 supersymmetric QCD shows that the theory may have a nontrivial infrared fixed point [1]. The beta function vanishes at the fixed point , so the N=1 supersymmetric QCD becomes a superconformal quantum field theory , since the trace of the energy-momentum tensor is proportional to the beta function [2]. The theory can now have a dual magnetic description in the sense that it describes the same physics as N=1 supersymmetric QCD , but the gauge coupling reverses. The dynamics of the N=1 supersymmetric QCD is very sensitive to the flavour number N _f and color number N _c . With different choices of the flavour and color numbers , the theory can be in distinct dynamical phases [3]. Therefore, the N = 1 superconformal symmetry does not occur for an arbitrary...