Composite non-Abelian Flux Tubes in N=2 SQCD
  Composite non-Abelian vortices in N=2 supersymmetric U(2) SQCD are investigated. The internal moduli space of an elementary non-Abelian vortex is CP^1. In this paper we find a composite state of two coincident non-Abelian vortices explicitly solving the first order BPS equations. Topology of the internal moduli space T is determined in terms of a discrete quotient CP^2/Z_2. The spectrum of physical strings and confined monopoles is discussed.   This gives indirect information about the sigma model with target space T. 
R. Auzzi, M. Shifman and A. Yung