Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/18053
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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 0556-2821 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1103/physrevd.67.114506 |
Appears in Collections: | Aurora harvest 6 Physics publications Special Research Centre for the Subatomic Structure of Matter publications |
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hdl_18053.pdf | Published version | 211.69 kB | Adobe PDF | View/Open |
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