Unquenched QCD simulation results

Aoki, Sinya

doi:10.1016/s0920-5632(01)00920-3

Cited by 32 publications

(11 citation statements)

References 51 publications

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“…'The staggered and Wilson fermion Edinburgh plots strongly disagree'. I believe, the reason of the disagreement in Fig.4 in [89] are the very large cut-off effects in the unimproved staggered data which made a continuum extrapolation unreliable. This is nicely demonstrated in Fig.19 of ref.…”

Section: On Quenched Spectroscopymentioning

confidence: 98%

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Lattice 2001: Reflections

Hasenfratz

2002

Nuclear Physics B - Proceedings Supplements

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Section: On Quenched Spectroscopymentioning

confidence: 98%

“…In my talk I referred to Sinya Aoki's contribution in Bangalore [89], where the strong disagreement between the staggered and Wilson Edinburgh plots was discussed. The situation concerning the hyperfine splittings confused me also.…”

Section: On Quenched Spectroscopymentioning

confidence: 99%

Lattice 2001: Reflections

Hasenfratz

2002

Nuclear Physics B - Proceedings Supplements

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“…(µ) [51] evaluated at a fixed scale µ, which is a constant. Higher order perturbative corrections of order g 4 a log a can be neglected because in our short range of lattice spacings log a is almost constant.…”

Section: Msmentioning

confidence: 99%

Erratum: Light hadron spectroscopy with two flavors of dynamical quarks on the lattice [Phys. Rev. D65, 054505 (2002)]

Khan¹,

Aoki²,

Boyd³

et al. 2003

Phys. Rev. D

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We present results of a numerical calculation of lattice QCD with two degenerate flavors of dynamical quarks, identified with up and down quarks, and with a strange quark treated in the quenched approximation. The lattice action and simulation parameters are chosen with a view to carrying out an extrapolation to the continuum limit as well as chiral extrapolations in dynamical up and down quark masses. Gauge configurations are generated with a renormalization-group improved gauge action and a mean field improved clover quark action at three values of β = 6/g 2 , corresponding to lattice spacings of a ≈ 0.22, 0.16 and 0.11 fm, and four sea quark masses corresponding to mPS/mV ≈ 0.8, 0.75, 0.7 and 0.6. The sizes of lattice are chosen to be 12 3 × 24, 16 3 × 32 and 243 × 48 so that the physical spatial size is kept constant at La ≈ 2.5 fm. Hadron masses, light quark masses and meson decay constants are measured at five valence quark masses corresponding to mPS/mV ≈ 0.8, 0.75, 0.7, 0.6 and 0.5. We also carry out complementary quenched simulations with the same improved actions. The quenched spectrum from this analysis agrees well in the continuum limit with the one of our earlier work using the standard action, quantitatively confirming the systematic deviation of the quenched spectrum from experiment. We find the twoflavor full QCD meson masses in the continuum limit to be much closer to experimental meson masses than those from quenched QCD. When using the K meson mass to fix the strange quark mass, the difference between quenched QCD and experiment of 2.6 −0.031 in two-flavor full QCD, approaching the experimental value J ≈ 0.48. We take these results as manifestations of sea quark effects in two-flavor full QCD. For baryon masses full QCD values for strange baryons such as Ξ and Ω are in agreement with experiment, while they differ increasingly with decreasing strange quark content, resulting in a nucleon mass higher than experiment by 10% and a ∆ mass by 13%. The pattern suggests finite size effects as a possible origin for this deviation. For light quark masses in the continuum limit we obtain m −11 MeV (φ-input), which are reduced by about 25% compared to the values in quenched QCD. We also present results for decay constants where large scaling violations obstruct a continuum extrapolation. Need for a non-perturbative estimate of renormalization factors is discussed.

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“…The results from different actions only need to agree in the continuum limit. In the past there was a controversy that the quenched Edinburgh plots for the Wilson and staggered actions did not agree in the continuum limit [58]. This was largely resolved by better extrapolations to the continuum limit [59,60].…”

Section: Brief Overview Of Status Of Unquenched Qcdmentioning

confidence: 99%