Excited nucleon spectrum using a non-perturbatively improved clover fermion action
Abstract
We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity state is computed in quenched lattice QCD using an -improved clover fermion action, and a splitting found with the nucleon mass. The calculation is performed on two lattice volumes, and three lattice spacings enabling a study of both finite-volume and finite-lattice-spacing uncertainties. A measurement of the first excited radial excitation of the nucleon finds a mass considerably larger than that of the negative-parity ground state, in accord with other lattice determinations but in disagreement with experiment. Results are also presented for the lightest negative-parity state.
Keywords
Cite
@article{arxiv.hep-lat/0112031,
title = {Excited nucleon spectrum using a non-perturbatively improved clover fermion action},
author = {LHPC Collaboration and D. G. Richards and QCDSF Collaboration and : and M. Gockeler and R. Horsley and D. Pleiter and P. E. L. Rakow and G. Schierholz and UKQCD Collaboration and : and C. M. Maynard},
journal= {arXiv preprint arXiv:hep-lat/0112031},
year = {2012}
}
Comments
7 pages, 5 figures, uses espcrc2. Talk presented at Workshop on Lattice Hadron Physics, Colonial Club Resort, Cairns, Australia, July 9-18, 2001. Corrected error in determination of mass of excited, positive-parity nucleon resonance