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

C. M. Maynard; D. G. Richards; D. Pleiter; G. Schierholz; LHPC Collaboration; P. E. L. Rakow; QCDSF Collaboration; R. Horsley; UKQCD Collaboration: M. Gockeler

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

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arxiv hep-lat/0106022 v2 pith:5HOPPOIS submitted 2001-06-26 hep-lat hep-phnucl-th

LHPC Collaboration , QCDSF Collaboration , UKQCD Collaboration: M. Gockeler , R. Horsley , C. M. Maynard , D. Pleiter , P. E. L. Rakow , D. G. Richards

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G. Schierholz

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keywords actionfermioncalculationimprovedlatticemassnegative-parityobtained

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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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