Lattice Calculation of Baryon Masses using the Clover Fermion Action

Abstract

We present a calculation of the lowest-lying baryon masses in the quenched approximation to QCD. The calculations are performed using a non-perturbatively improved clover fermion action, and a splitting is found between the masses of the nucleon and its parity partner. An analysis of the mass of the first radial excitation of the nucleon finds a value considerably larger than that of the parity partner of the nucleon, and thus little evidence for the Roper resonance as a simple three-quark state

4 pages, 3 figures, uses ws-p8-50x6-00.cls. Talk presented at Baryons 2002, Jefferson Laboratory, Newport News, VA, USA, 3rd to 8th March, 2002, proceedings to be published by World Scientific