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

TL;DR

This paper investigates the wave functions of $[ extbf{70},1^-]$ baryons within the $1/N_c$ expansion, comparing exact and approximate forms, and finds that operators acting on the entire system yield better fits than those acting separately on core and excited quark.

Contribution

It demonstrates that using operators on the whole baryon system improves the accuracy of mass fits over the traditional core-plus-excited-quark approach.

Findings

Exact and approximate wave functions produce similar mass operator results.

Operators acting on the whole system give better fit quality.

Separately acting operators lead to unsatisfactory quark dynamics coefficients.

Abstract

Much work has been devoted to the study of nonstrange baryons belonging to the $[\textbf{70},1^-]$ 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.