Negative-parity Baryon Masses using an O(a)-improved Fermion Action

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.

13 pages, 8 figures, revtex Version accepted for publication in Physics Letters B. Some changes to discussion of chiral extrapolations; primary results unchanged

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