Dynamical Quark Effects in QCD on the Lattice - results from the CP-PACS

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dc.creatorKanaya, Kazuyuki
dc.date2000-09-22
dc.date.accessioned2026-07-07T03:42:45Z
dc.date.available2026-07-07T03:42:45Z
dc.descriptionResults of a systematic lattice QCD simulation with two degenerate flavors of sea quarks, identified as dynamical u and d quarks, are presented. The simulation was performed on a dedicated parallel computer, called CP-PACS, developed at the University of Tsukuba. Clear dynamical quark effects are observed in the light hadron mass spectrum and in the light quark masses: In the light hadron mass spectrum, major parts of the discrepancy between quenched QCD and experiment are shown to be removed by introducing two flavors of dynamical quarks. For the averaged mass of u and d quarks, we find $m_{ud}^{\bar{\rm MS}}(2{\rm GeV}) = 3.44^{+0.14}_{-0.22}$ MeV using the $π$ and $ρ$ meson masses as physical input, and for the s quark mass, we obtain $m_{s}^{\bar{\rm MS}}(2{\rm GeV}) = 88^{+4}_{-6}$ MeV or $90^{+5}_{-11}$ MeV with the K or $ϕ$ meson mass as additional input. These values are about 20-30% smaller than the previous estimates in the quenched approximation. We also discuss the U(1) problem and B meson decay constants.
dc.descriptionTalk presented at the XXXth International Conference on High Energy Physics (ICHEP 2000), July 27-August 2, 2000, Osaka, Japan. LaTeX2e, 7 pages, 5 PS figures. ws-p10x7.cls required
dc.identifierhttps://arxiv.org/abs/hep-ph/0009263
dc.identifierhttp://arxiv.org/abs/hep-ph/0009263
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/39999
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDynamical Quark Effects in QCD on the Lattice - results from the CP-PACS
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