First results from 2+1-flavor domain wall QCD: Mass spectrum, topology change, and chiral symmetry with L{sub s}=8

Journal Article · Fri Jun 01 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.114501· OSTI ID:20929558

Antonio, D J; Bowler, K C; Boyle, P A; Hart, A; Kennedy, A D; Kenway, R D; Tweedie, R J ^[1]; Blum, T ^[2]; Christ, N H; Cohen, S D; Li, S; Lin, M F; Mawhinney, R D ^[3]; Clark, M A ^[4]; Dawson, C ^[2]; Hashimoto, K ^[2]; Izubuchi, T ^[2]; Joo, B ^[5]; Jung, C; Soni, A ^[6]

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1. SUPA, School of Physics, The University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
2. RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Physics Department, Columbia University, New York, New York 10027 (United States)
4. Center for Computational Science, 3 Cummington Street, Boston University, Massachusetts 02215 (United States)
5. Jefferson Laboratory, Newport News, Virginia 23606 (United States)
6. Brookhaven National Laboratory, Upton, New York 11973 (United States)

We present results for the static interquark potential, light meson and baryon masses, and light pseudoscalar meson decay constants obtained from simulations of domain wall QCD with one dynamical flavour approximating the s quark, and two degenerate dynamical flavours with input bare masses ranging from m{sub s} to m{sub s}/4 approximating the u and d quarks. We compare these quantities obtained using the Iwasaki and DBW2 improved gauge actions, and actions with larger rectangle coefficients, on 16{sup 3}x32 lattices. We seek parameter values at which both the chiral symmetry breaking residual mass due to the finite lattice extent in the fifth dimension and the Monte Carlo time history for topological charge are acceptable for this set of quark masses at lattice spacings above 0.1 fm. We find that the Iwasaki gauge action is best, demonstrating the feasibility of using QCDOC to generate ensembles which are good representations of the QCD path integral on lattices of up to 3 fm in spatial extent with lattice spacings in the range 0.09-0.13 fm. Despite large residual masses and a limited number of sea quark-mass values with which to perform chiral extrapolations, our results for light hadronic physics scale and agree with experimental measurements within our statistical uncertainties.

• OSTI ID: 20929558
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 11; Other Information: DOI: 10.1103/PhysRevD.75.114501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHIRAL SYMMETRY
CHIRALITY
D QUARKS
EXTRAPOLATION
FLAVOR MODEL
MASS
MASS SPECTRA
MONTE CARLO METHOD
PARTICLE DECAY
PATH INTEGRALS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
S QUARKS
SIMULATION
SYMMETRY BREAKING
TOPOLOGY