Nucleon, {Delta}, and {Omega} excited state spectra in N{sub f}=2+1 lattice QCD

Bulava, J; Edwards, R G; Joo, B; Richards, D G; Engelson, E; Wallace, S J; Lin, H-W; Morningstar, C

doi:10.1103/PHYSREVD.82.014507

Title: Nucleon, {Delta}, and {Omega} excited state spectra in N{sub f}=2+1 lattice QCD

Journal Article · Thu Jul 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.014507· OSTI ID:21410052

Bulava, J ^[1]; Edwards, R G; Joo, B; Richards, D G ^[2]; Engelson, E; Wallace, S J ^[3]; Lin, H-W ^[4]; Morningstar, C ^[5]

NIC, DESY, Platanenallee 6, D-15738, Zeuthen (Germany)
Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

The energies of the excited states of the nucleon, {Delta}, and {Omega} are computed in lattice QCD, using two light quarks and one strange quark on anisotropic lattices. The calculation is performed at three values of the light quark mass, corresponding to pion masses m{sub {pi}=}392(4), 438(3), and 521(3) MeV. We employ the variational method with a large basis of interpolating operators enabling six energies in each irreducible representation of the lattice to be distinguished clearly. We compare our calculation with the low-lying experimental spectrum, with which we find reasonable agreement in the pattern of states. The need to include operators that couple to the expected multihadron states in the spectrum is clearly identified.

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OSTI ID:: 21410052

Journal Information:: Physical Review. D, Particles Fields, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevD.82.014507; (c) 2010 The American Physical Society; ISSN 0556-2821

Country of Publication:: United States

Language:: English

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Title: Nucleon, {Delta}, and {Omega} excited state spectra in N{sub f}=2+1 lattice QCD

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