Large Nc Limit of Spin-Flavor Breaking in Excited Baryon Levels
Abstract
Spin-flavor symmetry breaking in the levels of excited Baryons are studied to leading order in the 1/Nc expansion. This breaking occurs at zeroth order. For non-strange Baryons with a single quark excited, it is shown that to first order of perturbation theory the breaking is given by one 1-body operator (spin-orbit), and three 2-body operators, all involving the orbital angular momentum of the excited quark. Higher-body operators can be reduced to that set of operators. As illustration, p-wave Baryons are briefly discussed.
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