New look at the $[{\bf 70},1^-]$ baryon multiplet in the $1/N_c$ expansion

Details New look at the $[{\bf 70},1^-]$ baryon multiplet in the $1/N_c$ expansion New look at the $[{\bf 70},1^-]$ baryon multiplet in the $1/N_c$ expansion

2006-10-09

arxiv.org/abs/hep-ph/0610099v4

Nucl.Phys.A811:291-305,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 7 tables, to be published in Nuclear Physics A

Scientific paper

10.1016/j.nuclphysa.2008.07.006

So far, the masses of excited states of mixed orbital symmetry and in particular those of nonstrange $[{\bf 70},1^-]$ 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 $\Delta$ as the spin-spin term in $N$ resonances.

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