Coupled QCD sum rules for positive and negative-parity nucleons

Details Coupled QCD sum rules for positive and negative-parity nucleons Coupled QCD sum rules for positive and negative-parity nucleons

2005-03-16

arxiv.org/abs/hep-ph/0503150v3

Nucl.Phys. A764 (2006) 303-312

Physics

High Energy Physics

High Energy Physics - Phenomenology

14pages, 2figures

Scientific paper

10.1016/j.nuclphysa.2005.09.003

A new approach of the QCD sum rule is proposed in which positive and negative-parity baryons couple with each other. With positive and negative-parity states explicitly taken into account, sum rules are derived by means of the dispersion relation in energy. The method is applied to the nucleon channel and the parity splitting of the nucleon resonance states is studied. It is found that the obtained sum rules have a very good Borel stability. This suggests that the ansatz for the spectral function in the present sum rule approximates the physical spectrum better than the usual lowest pole plus continuum ansatz. The predicted masses of the positive and negative nucleons reproduce the experimental ones fairly well. Especially, the mass difference is extremely close to the experimental value.

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