Unquenched QCD with light quarks

被引:4
作者
Duncan, A [1 ]
Eichten, E
Yoo, J
机构
[1] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[2] Fermilab Natl Accelerator Lab, Theory Grp, Batavia, IL 60510 USA
关键词
D O I
10.1103/PhysRevD.68.054505
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present recent results in unquenched lattice QCD with two degenerate light sea quarks using the truncated determinant approximation (TDA). In the TDA the infrared modes contributing to the quark determinant are computed exactly up to some cutoff in quark off-shellness (typically 2Lambda(QCD)). This approach allows simulations to be performed at much lighter quark masses than possible with conventional hybrid Monte Carlo techniques. Results for the static energy and topological charge distributions are presented using a large ensemble generated on very coarse (6(4)) but physically large lattices. Preliminary results are also reported for the static energy and meson spectrum on 10(3)x20 lattices (lattice scale a(-1)=1.15 GeV) at quark masses corresponding to pions of mass less than or equal to200 MeV. Using multiboson simulation to compute the ultraviolet part of the quark determinant the TDA approach becomes an exact algorithm with essentially no increase in computational effort. Some preliminary results using this fully unquenched algorithm are presented.
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页数:11
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共 26 条
  • [1] FULL QCD WITH THE LUSCHER LOCAL BOSONIC ACTION
    ALEXANDROU, C
    BORRELLI, A
    DEFORCRAND, P
    GALLI, A
    JEGERLEHNER, F
    [J]. NUCLEAR PHYSICS B, 1995, 456 (1-2) : 296 - 312
  • [2] LATTICE QCD ON SMALL COMPUTERS
    ALFORD, M
    DIMM, W
    LEPAGE, GP
    HOCKNEY, G
    MACKENZIE, PB
    [J]. PHYSICS LETTERS B, 1995, 361 (1-4) : 87 - 94
  • [3] Chiral loops and ghost states in the quenched scalar propagator
    Bardeen, W
    Duncan, A
    Eichten, E
    Isgur, N
    Thacker, H
    [J]. PHYSICAL REVIEW D, 2002, 65 (01):
  • [4] Fast fermion Monte Carlo
    deForcrand, P
    Takaishi, T
    [J]. NUCLEAR PHYSICS B, 1997, : 968 - 970
  • [5] HYBRID MONTE-CARLO
    DUANE, S
    KENNEDY, AD
    PENDLETON, BJ
    ROWETH, D
    [J]. PHYSICS LETTERS B, 1987, 195 (02) : 216 - 222
  • [6] Matching current correlators in lattice QCD to chiral perturbation theory
    Duncan, A
    Pernice, S
    Yoo, J
    [J]. PHYSICAL REVIEW D, 2002, 65 (09): : 945091 - 945097
  • [7] Duncan A, 2001, PHYS REV D, V63, DOI 10.1103/PhysRevD.63.111501
  • [8] Loop representations of the quark determinant in lattice QCD
    Duncan, A
    Eichten, E
    Roskies, R
    Thacker, H
    [J]. PHYSICAL REVIEW D, 1999, 60 (05):
  • [9] Efficient algorithm for QCD with light dynamical quarks
    Duncan, A
    Eichten, E
    Thacker, H
    [J]. PHYSICAL REVIEW D, 1999, 59 (01)
  • [10] El-Khadra AX, 1998, PHYS REV D, V58, DOI 10.1103/PhysRevD.58.014506