Excited nucleon spectrum using non-perturbative improved clover action

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We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity J = 1/2- state is computed in quenched lattice QCD using an O(a)-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 comparable, or even somewhat larger than that of the negative-parity ground state, in accord with other lattice determinations but in disagreement with experiment. ... continued below

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122 Kilobytes pages

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Richards, D. G.; Gockeler, M.; Horsley, R.; Pleiter, D.; Rakow, P. E. L.; Schierholz, G. et al. July 1, 2001.

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We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity J = 1/2- state is computed in quenched lattice QCD using an O(a)-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 comparable, or even somewhat 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 I=3/2 state.

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122 Kilobytes pages

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  • Workshop on Lattice Hadron Physics, Colonial Club Resort, Cairns (AU), 07/09/2001--07/18/2001

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  • Report No.: JLAB-THY-01-38
  • Report No.: DOE/ER/40150-2026
  • Report No.: hep-lat/0112031
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 792661
  • Archival Resource Key: ark:/67531/metadc738855

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  • July 1, 2001

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  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 5, 2016, 9:29 p.m.

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Richards, D. G.; Gockeler, M.; Horsley, R.; Pleiter, D.; Rakow, P. E. L.; Schierholz, G. et al. Excited nucleon spectrum using non-perturbative improved clover action, article, July 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc738855/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.