Journal
PHYSICAL REVIEW D
Volume 83, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.114505
Keywords
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Funding
- U.S. National Science Foundation [PHY-0510020, PHY-0653315, PHY-0704171, PHY-0969863, PHY-0970137]
- National Institute for Computational Sciences [TG-PHY100027, TG-MCA075017]
- Science Foundation Ireland [07/RFP/PHYF168]
- Science Foundation Ireland (SFI) [07/RFP/PHYF168] Funding Source: Science Foundation Ireland (SFI)
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969863, 0970137] Funding Source: National Science Foundation
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A new method of stochastically estimating the low-lying effects of quark propagation is proposed which allows accurate determinations of temporal correlations of single-hadron and multihadron operators in lattice QCD. The method is well suited for calculations in large volumes. Contributions involving quark propagation connecting hadron sink operators at the same final time can be handled in a straightforward manner, even for a large number of final time slices. The method exploits Laplacian Heaviside (LapH) smearing. Z(N) noise is introduced in a novel way, and variance reduction is achieved using judiciously-chosen noise-dilution projectors. The method is tested using isoscalar mesons in the scalar, pseudoscalar, and vector channels, and using the two-pion system of total isospin I = 0, 1, 2 on large anisotropic 24(3) X 128 lattices with spatial spacing a(s) similar to 0.12 fm and temporal spacing a(t) similar to 0.034 fm for pion masses m(pi) approximate to 390 and 240 MeV.
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