Excited state baryon spectroscopy from lattice QCD

By R. Edwards, J. Dudek, D. Richards, S. Wallace. Lattice 2011 - The 29th International Symposium on Lattice Field Theory, Squaw Valley, Lake Tahoe, CA, USA, July 11, 2011, 2011

291 citations recorded by the source corpus.

Here, we present a calculation of the Nucleon and Delta excited state spectrum on dynamical anisotropic clover lattices. A method for operator construction is introduced that allows for the reliable identification of the continuum spins of baryon states, overcoming the reduced symmetry of the cubic lattice. Using this method, we are able to determine a spectrum of single-particle states for spins up to and including J = 7/2, of both parities, the first time this has been achieved in a lattice calculation. We find a spectrum of states identifiable as admixtures of SU(6) Ⓧ O(3) representations and a counting of levels that is consistent with the non-relativistic $qqq$ constituent quark model. This dense spectrum is incompatible with quark-diquark model solutions to the "missing resonance problem" and shows no signs of parity doubling of states.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/681a5f5778cf76772077d66c64a82f8ce93cc994

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

STUDIES OF NUCLEON RESONANCE STRUCTURE IN EXCLUSIVE MESON ELECTROPRODUCTION (2012, background): “[127] are shown in red (the ground state), green and blue .”
Excited and exotic charmonium spectroscopy from lattice QCD (2012, background): “2951(22) [14], to the experimental mass, mΩ = 1672.”
Hadronic molecules (2017, background): “There has been a remarkable progress in the last years in this field, see e.g. (Baron et al., 2010; Dürr et al., 2008; Edwards et al., 2011; Liu, 2017; Liu et al., 2012).”
Scattering processes and resonances from lattice QCD (2017, methodology): “Such matrix elements would provide a more rigorous framework with which to build on existing analyses where gluonic content has been inferred from operator overlaps (Dudek, 2011; Dudek and Edwards, 2012; Dudek et al., 2013a, 2011a, 2009, 2010; Edwards et al., 2011; Liu et al., 2012).”
Baryons as relativistic three-quark bound states (2016, background): “On the other hand, some of those ‘missing’ states have now started to appear with photoproduction experiments, and also recent mass spectra from lattice QCD find a multitude of states which are closer to those in the symmetric quark model [281, 325, 326], which has led to the occasional claim that d”
Light-front holographic QCD and emerging confinement (2014, background): “However, the excitation spectrum of the light hadrons, and particularly nucleons, represent a formidable challenge to lattice QCD due to the enormous computational complexity required for the extraction of meaningful data beyond the leading ground state configuration [176].”
Light Hadron Masses from Lattice QCD (2012, background): “More recently, also the spins of nucleon and ∆ excitations up to spin 7/2 have been identified by (Edwards et al., 2011).”