Excited State Nucleon Spectrum with Two Flavors of Dynamical Fermions

Abstract

Highly excited states for isospin 1/2 baryons are calculated for the first time using lattice QCD with two flavors of dynamical quarks. Anisotropic lattices are used with two pion masses: 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 24^3x64, spatial lattice spacing a_s = 0.11 fm and temporal lattice spacing a_t = 1/3 a_s. 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 5/2 has been realized for the first time on the lattice.

21 pages, 12 figures

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Cited by in corpus (21)

• Pentaquark and Tetraquark states
• On the generalized eigenvalue method for energies and matrix elements in lattice field theory
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• Nuclear Physics from Lattice QCD
• Adaptive multigrid algorithm for the lattice Wilson-Dirac operator
• Twenty-first Century Lattice Gauge Theory: Results from the QCD Lagrangian
• A variational study of two-nucleon systems with lattice QCD
• Positive-parity Excited-states of the Nucleon in Quenched Lattice QCD
• Time Dependence of Nucleon Correlation Functions in Chiral Perturbation Theory
• Ordering of Spin-$\frac{1}{2}$ Excitations of the Nucleon in Lattice QCD
• Separated Structure Functions for Exclusive $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Electroproduction at 5.5 GeV with CLAS
• The Dichotomous Nucleon: Some Radical Conjectures for the Large Nc Limit
• Extraction of the resonance parameters at finite times
• Baryon spin-flavor structure from an analysis of lattice QCD results of the baryon spectrum
• Exploring the Spectrum of QCD using the Lattice
• $\Lambda (1405)$ from lattice QCD
• Meson Production and Baryon Resonances at CLAS
• Excited States of the Nucleon in 2+1 Flavor QCD
• Gauge Field Generation on Large-Scale GPU-Enabled Systems