Excited state nucleon spectrum with two flavors of dynamical fermions

John M. Bulava, Robert G. Edwards, Eric Engelson, Justin Foley, Bálint Joó, Adam Lichtl, Huey Wen Lin, Nilmani Mathur, Colin Morningstar, David G. Richards, Stephen J. Wallace

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Highly excited states for isospin 12 baryons are calculated for the first time using lattice QCD with two flavors of dynamical quarks. Anisotropic lattices are used with two pion masses, mπ=416(36)MeV and 578(29) MeV. The lowest four energies are reported in each of the six irreducible representations of the octahedral group at each pion mass. The lattices used have dimensions 243×64, spatial lattice spacing as 0.11fm, and temporal lattice spacing at=13as. Clear evidence is found for a 5-2 state in the pattern of negative-parity excited states. This agrees with the pattern of physical states and spin 52 has been realized for the first time on the lattice.

Original languageEnglish
Article number034505
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume79
Issue number3
DOIs
StatePublished - Feb 23 2009
Externally publishedYes

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