Published February 1, 2009 | Version v1
Journal article Metadata-only

Excited state nucleon spectrum with two flavors of dynamical fermions

Creators

  • 1. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
  • 2. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
  • 3. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
  • 4. RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  • 5. Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400005 (India)

Description

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, 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 243x64, spatial lattice spacing as≅0.11 fm, and temporal lattice spacing at=(1/3)as. 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.

Additional details

Identifiers

DOI
10.1103/PhysRevD.79.034505;
arXiv
arXiv:0901.0027v1;

Publishing Information

Journal Title
Physical Review. D, Particles Fields
Journal Volume
79
Journal Issue
3
Journal Page Range
p. 034505-034505.17
ISSN
0556-2821
CODEN
PRVDAQ

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
41010760
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
ANISOTROPY; EXCITED STATES; FLAVOR MODEL; IRREDUCIBLE REPRESENTATIONS; ISOSPIN; LATTICE FIELD THEORY; MASS; MEV RANGE 100-1000; NUCLEONS; PARITY; PIONS; QUANTUM CHROMODYNAMICS; QUARKS; SIMULATION; SPECTRA; SPIN
Descriptors DEC
ANGULAR MOMENTUM; BARYONS; BOSONS; COMPOSITE MODELS; CONSTRUCTIVE FIELD THEORY; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; FERMIONS; FIELD THEORIES; HADRONS; MATHEMATICAL MODELS; MESONS; MEV RANGE; PARTICLE MODELS; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; QUARK MODEL

Optional Information

Notes
(c) 2009 The American Physical Society