Parity doublets in the baryon spectrum

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Parity Doublets in the Baryon Spectrum

Physics of the low-lying and high-lying hadrons in the light flavors sector is reviewed. While the low-lying hadrons are strongly affected by both U(1) A and spontaneous SU(2) L × SU(2) R breakings, in the high-lying hadrons these symmetries are restored. A manifestation is a persistence of the chiral multiplet structure in both baryon and meson spectra. A fundamental origin of this phenomenon ...

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Parity doublets and chiral symmetry restoration in baryon spectrum

It is argued that an appearance of the near parity doublets in the upper part of the light baryon spectrum is an evidence for the chiral symmetry restoration in the regime where a typical momentum of quarks is around the chiral symmetry breaking scale. Thus one observes a phase transition in the upper part of the light baryon spectrum. The average kinetic energy of the constituent quarks in thi...

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Do parity doublets in the baryon spectrum reflect restoration of chiral symmetry ?

We discuss the mass spectrum of highly-excited nucleon and ∆ * resonances. The spectrum exhibits parity doublets, pairs of resonances of identical total angular momentum J but of opposite parity. It has been proposed that the parity doublets evidence restoration of chiral symmetry at large baryon excitation energies. We compare this conjecture with the possibility that high-mass states are orga...

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Parity mixed doublets in A=36 nuclei.

The γ-circular polarizations (Pγ) and asymmetries (Aγ) of the parity forbidden M1 + E2 γ-decays: 36Cl∗(Jπ = 2;T = 1;Ex = 1.95 MeV) → 36Cl(Jπ = 2+;T = 1; g.s.) and 36Ar∗(Jπ = 2;T = 0;Ex = 4.97 MeV) → 36Ar∗(Jπ = 2+;T = 0;Ex = 1.97 MeV) are investigated theoretically. We use the recently proposed Warburton-Becker-Brown shell-model interaction. For the weak forces we discuss comparatively different...

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Negative-Parity Baryon Spectroscopy

Results are reported for the first calculation of the low-lying spin-1/2 odd-parity octet baryon masses using O(a) improved gluon and fermion actions. Methods for removing even-parity ground-state contaminations from the two-point correlation functions at zero and finite momenta are outlined. We investigate the properties of two odd-parity interpolating fields based on the established interpola...

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ژورنال

عنوان ژورنال: Nuclear Physics A

سال: 2005

ISSN: 0375-9474

DOI: 10.1016/j.nuclphysa.2005.03.122