Melnitchouk, W.Hedditch, J.Leinweber, D.Williams, A.Zanotti, J.Zhang, J.2006-12-062006-12-062003Nuclear Physics B - Proceedings Supplements, 2003, vol.119, pp.293-2950920-56321873-3832http://hdl.handle.net/2440/18026Copyright © 2003 Published by Elsevier B.V. Printed in U.S.A. Submitted to Cornell University’s online archive www.arXiv.org in 2003 by James Zanotti. Post-print sourced from www.arxiv.org.Masses of positive and negative parity excited nucleons and hyperons are calculated in quenched lattice QCD using an O(a^2) improved gluon action and a fat-link clover fermion action in which only the irrelevant operators are constructed with fat links. The results are in agreement with earlier N* simulations with improved actions, and exhibit a clear mass splitting between the nucleon and its parity partner, as well as a small mass splitting between the two low-lying J^P={1/2}^- N* states. Study of different Lambda interpolating fields suggests a similar splitting between the lowest two {1/2}^- Lambda* states, although the empirical mass suppression of the Lambda*(1405) is not seen.enConference paper002003017410.1016/S0920-5632(03)01542-10001830741000462-s2.0-003828633559019Leinweber, D. [0000-0002-4745-6027]Williams, A. [0000-0002-1472-1592]Zanotti, J. [0000-0002-3936-1597]