The Positive-Parity Baryon Spectrum and the Role of Hybrid Baryons

Abstract

We calculate the low-lying spectra for the positive-parity $\Delta$ and $N$ at two pion masses of 358 and 278 MeV using an isotropic clover action with two degenerate light-quaark and one strange-quark flavors through the application of the generalized variational method within the distillation framework. The spectrum exhibits the general features observed in previous calculations using an anisotropic clover lattice, with a counting of states at least as rich as the quark model. Furthermore, we identify states that are hybrid in nature, where gluonic degrees of freedom play a structural role, indicatinng that such states appear a feature of the excited baryon spectrum, irrespective of the lattice action, or the precise details of the smearing of the lattice interpolating operators used to identify such states.

References in corpus (20)

• High-precision scale setting in lattice QCD
• A novel quark-field creation operator construction for hadronic physics in lattice QCD
• Toward the excited meson spectrum of dynamical QCD
• First results from 2+1 dynamical quark flavors on an anisotropic lattice: light-hadron spectroscopy and setting the strange-quark mass
• Isoscalar meson spectroscopy from lattice QCD
• Charmonium excited state spectrum in lattice QCD
• Tuning for Three-flavors of Anisotropic Clover Fermions with Stout-link Smearing
• Multichannel one-to-two transition amplitudes in a finite volume
• Pion-nucleon scattering in the Roper channel from lattice QCD
• Tetraquark operators in lattice QCD and exotic flavour states in the charm sector
• Decays of an exotic $1^{-+}$ hybrid meson resonance in QCD
• Lattice QCD determination of patterns of excited baryon states
• Excited State Nucleon Spectrum with Two Flavors of Dynamical Fermions
• Hamiltonian effective field theory study of the ${\mathbf{N}}^{\ast }(1440)$ resonance in lattice QCD
• Positive-parity Excited-states of the Nucleon in Quenched Lattice QCD
• Ordering of Spin-$\frac{1}{2}$ Excitations of the Nucleon in Lattice QCD
• Even parity excitations of the nucleon in lattice QCD
• Distillation at High-Momentum
• Roper State from Overlap Fermions
• Role of chiral symmetry in the nucleon excitation spectrum

Cited by in corpus (8)

• Light Baryon Spectroscopy
• Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics
• Polarization observables in double neutral pion photoproduction
• Chiral Analysis of the Nucleon Mass and Sigma Commutator
• $\Delta$ baryon spectroscopy in lattice QCD
• The Continuum and Leading Twist Limits of Parton Distribution Functions in Lattice QCD
• The transversity parton distribution function of the nucleon using the pseudo-distribution approach
• Unpolarized gluon distribution in the nucleon from lattice quantum chromodynamics