Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-04-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at the 1995 Int'l Workshop on Nuclear & Particle Physics, Seoul, Korea. Accompanied by uu-compressed figures, a
Scientific paper
In this talk we review how effective theories of mesons and baryons become exactly soluble in the large-N_c limit. We start with a generic hadron Lagrangian constrained only by certain well-known large-N_c selection rules. The bare vertices of the theory are dressed by an infinite class of UV divergent Feynman diagrams at leading order in 1/N_c. We show how all these leading-order diagrams can be summed exactly using semiclassical techniques. The saddle-point field configuration is reminiscent of the chiral bag: hedgehog pions outside a sphere of radius \Lambda^{-1} (\Lambda being the UV cutoff of the effective theory) matched onto nucleon degrees of freedom for r < \Lambda^{-1}. The effect of this pion cloud is to renormalize the bare nucleon mass, nucleon-\Delta hyperfine mass splitting, and Yukawa couplings of the theory. The corresponding large-N_c renormalization group equations for these parameters are presented, and solved explicitly in a series of simple models. We explain under what conditions the Skyrmion emerges as a UV fixed-point of the RG flow as \Lambda --> \infty.
Dorey Nick
Mattis Michael
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