Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons

Abstract

The pion nucleon sigma-term is extracted on the basis of the soliton picture of the nucleon from the mass spectrum of usual and the recently observed exotic baryons, assuming that they have positive parity. The value found is consistent with that inferred by means of conventional methods from pion nucleon scattering data. The study can also be considered as a phenomenological consistency check of the soliton picture of baryons.

8 pages, 2 figures, references added, discussion extended, to appear in Eur.Phys.J.A

References in corpus (1)

• Cutoff schemes in chiral perturbation theory and the quark mass expansion of the nucleon mass

Cited by in corpus (9)

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• Phenomenology of spin 3/2 baryons with pentaquarks
• $\Lambda$$\Lambda$ interactions in finite-density QCD sum rules
• Meson-baryon sigma terms in QCD Sum Rules
• The pseudo scalar form factor of the nucleon, the sigma-like term, and the $L_0^{+}$ amplitude for charged pion electro-production near threshold