Overlap valence on 2+1 flavor domain wall fermion configurations with deflation and low-mode substitution
- Department of Physics, Duke University, Durham, North Carolina 27708 (United States)
- Department of Physics, George Washington University, Washington, D.C. 20052 (United States)
- Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049 (China)
- Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
- Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)
- Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 40005 (India)
- Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg (Germany)
- ZIMP and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027 (China)
The overlap fermion propagator is calculated on 2+1 flavor domain-wall fermion gauge configurations on 16{sup 3}x32, 24{sup 3}x64 and 32{sup 3}x64 lattices. With hyper-cubic (HYP) smearing and low eigenmode deflation, it is shown that the inversion of the overlap operator can be expedited by {approx}20 times for the 16{sup 3}x32 lattice and {approx}80 times for the 32{sup 3}x64 lattice. The overhead cost for calculating eigenmodes ranges from 4.5 to 7.9 propagators for the above lattices. Through the study of hyperfine splitting, we found that the O(m{sup 2}a{sup 2}) error is small and these dynamical fermion lattices can adequately accommodate quark mass up to the charm quark. A preliminary calculation of the low-energy constant {Delta}{sub mix} which characterizes the discretization error of the pion made up of a pair of sea and valence quarks in this mixed-action approach is carried out via the scalar correlator with periodic and antiperiodic boundary conditions. It is found to be small which shifts a 300 MeV pion mass by {approx}10 to 19 MeV on these sets of lattices. We have studied the signal-to-noise issue of the noise source for the meson and baryon. We introduce a new algorithm with Z{sub 3} grid source and low eigenmode substitution to study the many-to-all meson and baryon correlators. It is found to be efficient in reducing errors for the correlators of both mesons and baryons. With 64-point Z{sub 3} grid source and low-mode substitution, it can reduce the statistical errors of the light quark (m{sub {pi}{approx}2}00-300 MeV) meson and nucleon correlators by a factor of {approx}3-4 as compared to the point source. The Z{sub 3} grid source itself can reduce the errors of the charmonium correlators by a factor of {approx}3.
- OSTI ID:
- 21503716
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 82, Issue 11; Other Information: DOI: 10.1103/PhysRevD.82.114501; (c) 2010 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALGORITHMS
BOUNDARY CONDITIONS
CHARMONIUM
CONFIGURATION
D QUARKS
FLAVOR MODEL
MASS
MEV RANGE 100-1000
NOISE
NUCLEONS
PERIODICITY
PIONS
POINT SOURCES
PROPAGATOR
SIMULATION
U QUARKS
VALENCE
BARYONS
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MESONS
MEV RANGE
PARTICLE MODELS
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKONIUM
QUARKS
RADIATION SOURCES
VARIATIONS