Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2002-02-20
Phys.Rev.D67:114506,2003
Physics
High Energy Physics
High Energy Physics - Lattice
Correlation matrix analysis performed. Increased to 400 configurations. 22 pages, 13 figures, 15 tables
Scientific paper
10.1103/PhysRevD.67.114506
We present first results for the masses of positive and negative parity excited baryons calculated in lattice QCD using an O(a^2)-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. An correlation matrix analysis reveals two low-lying J^P=(1/2)^- states with a small mass splitting. The study of different Lambda interpolating fields suggests a similar splitting between the lowest two Lambda1/2^- octet states. However, the empirical mass suppression of the Lambda^*(1405) is not evident in these quenched QCD simulations, suggesting a potentially important role for the meson cloud of the Lambda^*(1405) and/or a need for more exotic interpolating fields.
Bilson-Thompson Sundance
Bonnet Frederic D. R.
Lee Frank X.
Leinweber Derek B. .
Melnitchouk Wally
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