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HK: Fachverband Hadronen und Kerne

HK 4: Hadron Structure and Spectroscopy I

HK 4.4: Vortrag

Montag, 16. März 2009, 15:15–15:30, H-ZO 20

A new look at the [70,1⁻] baryon multiplet in the 1/N_c expansion — •Nicolas Matagne¹ and Florica Stancu² — ¹Institut für Theoretische Physik, Universität Giessen, Germany — ²University of Liège, Institute of Physics B5, Sart Tilman, B-4000 Liège 1, Belgium

So far, the masses of excited states of mixed orbital symmetry and in particular those of nonstrange [70,1⁻] baryons derived in the 1/N_c expansion were based on the separation of a system of N_c quarks into a symmetric core and an excited quark. Here we avoid this separation and show that an advantage of this new approach is to substantially reduce the number of linearly independent operators entering the mass formula. A novelty is that the isospin-isospin term becomes as dominant in Δ as the spin-spin term in N resonances.