Baryon resonances from a novel fat-link fermion action

TL;DR

This paper reports on lattice QCD calculations of baryon resonances using a novel fat-link fermion action, showing consistent results with previous studies and revealing mass splittings between nucleon states.

Contribution

Introduction of a Fat Link Irrelevant Clover (FLIC) fermion action for baryon mass calculations in lattice QCD, demonstrating its effectiveness and consistency with prior results.

Findings

Mass splittings between nucleon and chiral partner observed.

Results agree with earlier calculations of N* resonances.

Indicates a splitting between J^P = 1/2^- states for different interpolating fields.

Abstract

We present first results for masses of positive and negative parity excited baryons in lattice QCD using an O(a^2) improved gluon action and a Fat Link Irrelevant Clover (FLIC) fermion action in which only the irrelevant operators are constructed with fat links. The results are in agreement with earlier calculations of N^* resonances using improved actions and exhibit a clear mass splitting between the nucleon and its chiral partner, even for the Wilson fermion action. The results also indicate a splitting between the lowest J^P = 1/2^- states for the two standard nucleon interpolating fields.