2004
DOI: 10.1103/physrevd.70.074503
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Light hadron spectroscopy in two-flavor QCD with small sea quark masses

Abstract: We extend the study of the light hadron spectrum and the quark mass in two-flavor QCD to smaller sea quark mass, corresponding to mP S /mV = 0.60-0.35. Numerical simulations are carried out using the RG-improved gauge action and the meanfield-improved clover quark action at β = 1.8 (a = 0.2 fm from ρ meson mass). We observe that the light hadron spectrum for small sea quark mass does not follow the expectation from chiral extrapolations with quadratic functions made from the region of mP S /mV = 0.80-0.55. Whe… Show more

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Cited by 31 publications
(25 citation statements)
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“…In a study of the O(a) improved theory conducted by the UKQCD collaboration [11], for example, using the even-odd preconditioned HMC algorithm, the cost figure on a 32×16 3 lattice at m π 420 MeV was 5.5 (11). Significantly smaller masses were reached by the CP-PACS collaboration on a coarse 24 × 12 3 lattice [15], and in these simulations, ν ranged from 9.4 (18) at m π 398 MeV to 29 (10) at m π 255 MeV. From this purely algorithmic point of view, the new algorithm is thus much more efficient than the algorithms previously used, particularly so at small quark masses.…”
Section: Performance Figures and Timingsmentioning
confidence: 99%
See 1 more Smart Citation
“…In a study of the O(a) improved theory conducted by the UKQCD collaboration [11], for example, using the even-odd preconditioned HMC algorithm, the cost figure on a 32×16 3 lattice at m π 420 MeV was 5.5 (11). Significantly smaller masses were reached by the CP-PACS collaboration on a coarse 24 × 12 3 lattice [15], and in these simulations, ν ranged from 9.4 (18) at m π 398 MeV to 29 (10) at m π 255 MeV. From this purely algorithmic point of view, the new algorithm is thus much more efficient than the algorithms previously used, particularly so at small quark masses.…”
Section: Performance Figures and Timingsmentioning
confidence: 99%
“…When the sea-quark effects are included in the simulations, much more computer time is required, particularly so in the chiral regime of QCD, where the widely used simulation algorithms slow down proportionally to the second or maybe even the third power of the masses of the light quarks [4]- [15]. So far, simulations of the Wilson theory (with or without O(a) corrections) thus proved to be impractical at lattice spacings a ≤ 0.1 fm and light-quark masses significantly smaller than half the physical mass of the strange quark.…”
Section: Introductionmentioning
confidence: 99%
“…Secondly, the lattice studies give as a rule rather high values for m 0 , e.g. in work [26] values of m 0 corresponds just to few tens of MeV . The smaller values are to be obtained in the continuous limit, which till now is performed only by an extrapolation procedure.…”
Section: Pion Mass and Quark Condensatementioning
confidence: 99%
“…For pioneering work for N f = 2 flavour lattice QCD see refs. [37][38][39]. We use data for the charged pseudo scalar meson mass m PS and the decay constant f PS computed in a range of 280 MeV m PS 650 MeV.…”
Section: Jhep08(2010)097mentioning
confidence: 99%