Quenched and first unquenched lattice HQET determination of the Bs-Meson width difference

Details Quenched and first unquenched lattice HQET determination of the Bs-Meson width difference Quenched and first unquenched lattice HQET determination of the Bs-Meson width difference

2000-10-26

arxiv.org/abs/hep-lat/0010048v2

Nucl.Phys.Proc.Suppl.94:350-353,2001

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice 2000 (Heavy Quark Physics), 4 pages, LaTeX. Some misprints corrected. No result changed

Scientific paper

10.1016/S0920-5632(01)00928-8

We present recent results for the prediction of the Bs lifetime difference from lattice Heavy Quark Effective Theory simulations. In order to get a next-to-leading order result we have calculated the matching between QCD and HQET and the two-loop anomalous dimensions in the HQET for all the \Delta B=2 operators, in particular for the operators which enter the width difference. We present results from quenched and, for the first time, from unquenched simulations. We obtain for the Bs lifetime difference, (\Delta\Gamma_Bs/\Gamma_Bs)^{(que.)}=(5.1+/- 1.9+/- 1.7)10^(-2) and (\Delta\Gamma_Bs/\Gamma_Bs)^{(unq.)}=(4.3+/- 2.0+/- 1.9)10^(-2) from the quenched and unquenched simulations respectively

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