The wave function of $[70,1^{-}]$ baryons in the $1/N_c$ expansion

Abstract

Much work has been devoted to the study of nonstrange baryons belonging to the $[\text{70},1^{-}]$ multiplet in the framework of the $1/N_c$ expansion. Using group theoretical arguments here we examine the relation between the exact wave function and the approximate one, customarily used in applications where the system is separated into a ground state core and an excited quark. We show that the exact and approximate wave functions globally give similar results for all of mass operators presented in this work. However we find that the inclusion of operators acting separately on the core and on the excited quark deteriorates the fit and leads to unsatisfactory values for the coefficients which encode the quark dynamics. Much better results are obtained when we include operators acting on the whole system, both for the exact and the approximate wave function.

18 pages, 9 tables, 1 section added (mixing angles), minor changes in the abstract and the conclusions, to be published in Phys. Rev. D

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Cited by in corpus (8)

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• Highly excited negative parity baryons in the $1/N_c$ expansion
• Baryon Tri-local Interpolating Fields
• Negative parity baryons in the $1/N_c$ expansion: the quark excitation versus the meson-nucleon resonance picture
• The Isgur-Karl model revisited
• Pion Electroproduction Amplitude Relations in the 1/N_c Expansion
• Group theoretical study of nonstrange and strange mixed symmetric baryon states $[N_c-1,1]$ in the $1/N_c$ expansion