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Excited [70,l(+)] baryons in large N-c QCD

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Publication Date
Keywords
  • Physical
  • Chemical
  • Mathematical & Earth Sciences :: Physics [G04]
  • Physique
  • Chimie
  • Mathématiques & Sciences De La Terre :: Physique [G04]
Disciplines
  • Physics

Abstract

The masses of the positive parity [70, 0(+)] and [70, 2(+)] non-strange baryons are calculated in large N-c QCD by considering the most dominant operators in an 1/N-c expansion. The approach is based on the introduction of an excited core, obtained after the last particle (an excited quark) has been removed. Configuration mixing is neglected, for simplicity. Although being a sub-leading 1/Nc order, we find that the spin-spin interaction plays a dominant role in describing the data. The role of No operators is also pointed out. We show how the contribution of the linear term in Nc, of the spin-spin and of the spin-orbit terms vary with the excitation energy. (c) 2005 Elsevier B.V. All rights reserved.

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