Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical Quark Effects in QCD on the Lattice - results from the CP-PACS   Results 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 $\pi$
and $\rho$ 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 $\phi$ 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.

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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn