Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-07-10
Phys.Rev.Lett.91:191601,2003
Physics
High Energy Physics
High Energy Physics - Theory
4 pages, RevTex. v2: note added at the end of the paper, ref. added. To appear in Phys.Rev.Lett
Scientific paper
10.1103/PhysRevLett.91.191601
We suggest a new large-N_c limit for multi flavor 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 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 semi-quantitative predictions for N_f=1 massless QCD which can be easily tested in lattice simulations. Finally, we comment on possible applications for pure SU(3) Yang-Mills theory and real QCD.
Armoni Adi
Shifman Michael
Veneziano Gabriele
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