Branches of N=1 Vacua and Argyres-Douglas Points

Abstract

We study the N=1 version of Argyres-Douglas (AD) points by making use of the recent developments in understanding the dynamics of the chiral sector of N=1 gauge theories. We shall consider N=1 U(N) gauge theories with an adjoint matter and look for the tree-level superpotential W(x) which reproduces the N=2 AD points via the factorization equation relating the N=1 and N=2 curves. We find that the following superpotentials generate the N=2 AD points: (1) W'(x)=x^N \pm 2Λ^N, (2) W'(x)=x^n, N-1\ge n \ge N/2+1. In case (1) the physics is essentially the same as the N=2 theory even in the presence of the superpotential. There seems to be an underlying structure of N-reduced KP hierarchy in the system. Case (2) occurs at the intersection of a number of N=1 vacua with massless monopoles. This branch of vacua is characterized by having s_+=0 or s_-=0 where s_{\pm} denotes the number of double roots in P_N(x)\pm 2Λ^N. It is possible to show that the mass gap in fact vanishes at this AD point. We conjecture that it represents a new class of N=1 superconformal field theory.

22 pages, 2 figures; v2 minor corrections, references added; v3 a reference added, to appear in JHEP

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