arXiv:hep-lat/0106022·v2·High Energy Physics — Lattice
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
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.
Comments: 13 pages, 8 figures, revtex Version accepted for publication in Physics Letters B. Some changes to discussion of chiral extrapolations; primary results unchanged