Nucleon Resonance Masses from QCD Sum Rules

TL;DR

This paper extends a QCD sum rule method to calculate nucleon resonance masses, achieving stable and accurate results by eliminating unknown spectral parts through specific integration kernels.

Contribution

It introduces a novel application of integration kernels in QCD sum rules to reliably determine nucleon resonance masses, improving stability and experimental agreement.

Findings

Results are stable across a wide range of R values.

Calculated masses agree well with experimental data.

The method effectively eliminates unknown spectral contributions.

Abstract

A method used previously to calculate the masses of the vector mesons is extended to the calculation of the nucleon resonances. The method is based on the choice of integration kernels which eliminate the unknown parts of the spectrum. We obtain remarkably stable results in a wide range of R, the radius of the integration contour in the complex plane. Agreement with experiment is good.