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Type: Journal article
Title: Excited baryons in lattice QCD
Author: Melnitchouk, W.
Bilson-Thompson, S.
Bonnet, F.
Hedditch, J.
Lee, F.
Leinweber, D.
Williams, A.
Zanotti, J.
Zhang, J.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2003; 67(11):114506-1-114506-17
Publisher: American Physical Soc
Issue Date: 2003
ISSN: 1550-7998
Statement of
W. Melnitchouk, S. Bilson-Thompson, F. D. R. Bonnet, J. N. Hedditch, F. X. Lee, D. B. Leinweber, A. G. Williams, J. M. Zanotti and J. B. Zhang
Abstract: We present the first results for the masses of positive and negative parity excited baryons calculated in lattice QCD using an O(a2)-improved gluon action and a fat-link irrelevant clover (FLIC) fermion action in which only the irrelevant operators are constructed with APE-smeared links. The results are in agreement with earlier calculations of N* resonances using improved actions and exhibit a clear mass splitting between the nucleon and its chiral partner. A correlation matrix analysis reveals two low-lying JP=1 / 2- states with a small mass splitting. The study of different Λ interpolating fields suggests a similar splitting between the lowest two Λ1 / 2- octet states. However, the empirical mass suppression of the Λ*(1405) is not evident in these quenched QCD simulations, suggesting a potentially important role for the meson cloud of the Λ*(1405) and/or a need for more exotic interpolating fields.
Rights: ©2003 American Physical Society
DOI: 10.1103/PhysRevD.67.114506
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