Orbitally Excited Baryons in Large Nc QCD
Abstract
We present a model-independent analysis of the mass spectrum of nonstrange l=1 baryons in large Nc QCD. The 1/Nc expansion is used to select and order a basis of effective operators that spans the nine observables (seven masses and two mixing angles). Comparison to the data provides support for the validity of the 1/Nc expansion, but also reveals that only a few nontrivial operators are strongly preferred. We show that our results have a consistent interpretation in a constituent quark model with pseudoscalar meson exchange interactions.
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