Chiral Symmetry of Nucleon Resonances in QCD sum rules
T. Nakamura, P. Gubler, M. Oka
TL;DR
This paper uses QCD sum rules to investigate the chiral properties of nucleon resonances, revealing that exotic five-quark operators do not strongly couple to certain nucleon states below 2 GeV.
Contribution
It demonstrates that five-quark operators with exotic chiral properties do not significantly couple to nucleon resonances under 2 GeV, refining understanding of chiral symmetry in QCD.
Findings
Exotic five-quark operators do not strongly couple to nucleon resonances below 2 GeV.
Nucleons with exotic chiral properties can form multiplets with standard nucleons.
QCD sum rules reveal limitations in coupling for certain chiral configurations.
Abstract
The QCD sum rule approach is employed in order to study chiral properties of positive- and negative-parity nucleon resonances. It is pointed out that nucleons with an ``exotic'' chiral property, which can be represented by local five-quark operators, can be paired with a standard nucleon forming a single chiral multiplet. The sum rules of the five-quark operators, however, are shown not to couple strongly to chirally-``exotic'' nucleon resonances at the mass region of less than 2 GeV.
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