2002/02/28 by W. Melnitchouk, Wally Melnitchouk, S. Bilson-Thompson +12 · 7 citations
Physics and Astronomy · #Baryon #Excited state #Fermion #High-Energy Particle Collisions Research #Lambda #Lattice (music) #Lattice QCD #Lattice field theory #Meson #Nuclear physics #Nucleon #Octet #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #hep-lat
paper · pdf · doi:10.1103/physrevd.67.114506
published as Phys.Rev.D67:114506,2003 · Correlation matrix analysis performed. Increased to 400 configurations. 22 pages, 13 figures, 15 tables
arxiv created 2003/03/18 · openalex publication_date 2003/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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)^\ensuremath- states with a small mass splitting. The study of different \ensuremathΛ interpolating fields suggests a similar splitting between the lowest two \ensuremathΛ(1)/(2)^\ensuremath- octet states. However, the empirical mass suppression of the \ensuremathΛ*(1405) is not evident in these quenched QCD simulations, suggesting a potentially important role for the meson cloud of the \ensuremathΛ*(1405) and/or a need for more exotic interpolating fields.