924 research outputs found
Anderson Localization in high temperature QCD: background configuration properties and Dirac eigenmodes
We investigate the properties of the background gauge field configurations
that act as disorder for the Anderson localization mechanism in the Dirac
spectrum of QCD at high temperatures. We compute the eigenmodes of the M\"obius
domain-wall fermion operator on configurations generated for the gauge
theory with two flavors of fermions, in the temperature range .
We identify the source of localization of the eigenmodes with gauge
configurations that are self-dual and support negative fluctuations of the
Polyakov loop , in the high temperature sea of . The dependence
of these observations on the boundary conditions of the valence operator is
studied. We also investigate the spatial overlap of the left-handed and
right-handed projected eigenmodes in correlation with the localization and the
corresponding eigenvalue. We discuss an interpretation of the results in terms
of monopole-instanton structures.Comment: 27 pages, 16 figures, 2 tables, minor corrections and typo
Width difference of the B_s mesons from lattice QCD
We extend our previous studies to calculate the B meson B parameters B_B and
B_S on the lattice, and present an update of the results for the B_s meson
width difference. We perform an extensive study of systematic errors in the
quenched calculation of the B-parameters, and find that the systematic errors
are in good control using the NRQCD action for heavy quark. We also report our
preliminary results from unquenched simulations.Comment: 4 pages, 3 figures; to appear in the Proceedings of the 4th
International Workshop on B Physics and CP Violation (BCP4), 19-23 Feb. 2001,
Ise-Shima, Japa
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