Supersymmetry relics in one-flavor QCD from a new 1/N expansion -: art. no. 191601

We suggest a new large-N-c limit for multiflavor QCD. Since fundamental and two-index antisymmetric representations are equivalent in SU(3), we have the option to define SU(N-c) QCD keeping quarks in the latter. We can then define a new 1/N-c expansion (at a fixed number of flavors N-f) that shares appealing properties with the topological (fixed N-f/N-c) expansion while being more suitable for theoretical analysis. In particular, for N-f=1, our large-N-c limit gives a theory that we recently proved to be equivalent, in the bosonic sector, to N=1 supersymmetric gluodynamics. Using known properties of the latter, we derive several qualitative and semiquantitative predictions for N-f=1 massless QCD that can be easily tested in lattice simulations. Finally, we comment on possible applications for pure SU(3) Yang-Mills theory and real QCD.