Spin-3/2 baryons in lattice QCD

Abstract

We present first results for masses of spin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fat links. In the isospin-1/2 sector, we observe, after appropriate spin and parity projection, a strong signal for the JP = 3/2- state, and find good agreement between the 1/2+ mass and earlier nucleon mass simulations with a spin-1/2 interpolating field. For the isospin-3/2 Δ states, clear mass splittings are observed between the various 1/2± and 3/2± channels, with the calculated level orderings in good agreement with those observed empirically.