Width difference of the Bs mesons from lattice QCD
Abstract
We extend our previous studies to calculate the B meson B parameters BB and BS on the lattice, and present an update of the results for the Bs 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.
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