arXiv:hep-lat/0201005·v1·High Energy Physics — Lattice
Baryon resonances from a novel fat-link fermion action
W.Melnitchouk🇦🇺 · S.Bilson-Thompson🇦🇺 · F.D.R.Bonnet🇦🇺 · P.D.Coddington🇦🇺 · D.B.Leinweber🇦🇺 · A.G.Williams🇦🇺 · J.M.Zanotti🇦🇺 · J.B.Zhang🇦🇺 · F.X.Lee🇺🇸
Abstract
We present first results for masses of positive and negative parity excited baryons 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 fat 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, even for the Wilson fermion action. The results also indicate a splitting between the lowest J^P = 1/2^- states for the two standard nucleon interpolating fields.
Comments: 5 pages, 3 figures, talk given by W.Melnitchouk at LHP 2001 workshop, Cairns, Australia