Negative-parity Baryon Masses using an O(a)-improved Fermion Action
LHPC Collaboration, QCDSF Collaboration, UKQCD Collaboration: M., Gockeler, R. Horsley, C. M. Maynard, D. Pleiter, P. E. L. Rakow, D. G., Richards, G. Schierholz
TL;DR
This paper calculates the mass of the lowest negative-parity baryon in quenched QCD using an improved fermion action, analyzing finite-volume and lattice-spacing effects, and comparing with unimproved methods.
Contribution
It introduces a non-perturbatively O(a)-improved clover fermion action for negative-parity baryon mass calculations, providing insights into systematic uncertainties.
Findings
A mass splitting between the nucleon and its parity partner was observed.
Finite-volume and lattice-spacing effects were systematically studied.
Comparison with unimproved Wilson fermion results was performed.
Abstract
We present a calculation of the mass of the lowest-lying negative-parity J=1/2- state in quenched QCD. Results are obtained using a non-perturbatively O(a)-improved clover fermion action, and a splitting is found between the mass of the nucleon and its parity partner. The calculation is performed on two lattice volumes and at three lattice spacings, enabling a study of both finite-volume and finite lattice-spacing uncertainties. A comparison is made with results obtained using the unimproved Wilson fermion action.
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