Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-12-06
Fortsch.Phys. 50 (2002) 531-537
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at the 18th AvH symposium ``100 Years Werner Heisenberg - Works and Impact'', Bamberg, Germany, September 26-30
Scientific paper
Numerical simulation of lattice QCD is now an indispensable tool for investigating non-perturbative properties of quarks at low energies. In this paper, I introduce a recent lattice QCD calculation of light hadron spectrum and quark masses performed on a dedicated parallel computer, CP-PACS. From a simulation of QCD with two flavors of dynamical quarks, we find $m_{ud}^{\bar{\rm MS}}(2{\rm GeV}) = 3.44^{+0.14}_{-0.22}$ MeV for the averaged mass of $u$ and $d$ quarks to reproduce the experimental masses of $\pi$ and $\rho$ mesons, and $m_{s}^{\bar{\rm MS}}(2{\rm GeV}) = 88^{+4}_{-6}$ MeV or $90^{+5}_{-11}$ MeV to reproduce the $K$ or $\phi$ meson mass. These values are about 20--30% smaller than the previous estimates using the quenched approximation.
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