Quenched and first unquenched lattice HQET determination of the Bs-Meson width difference
V. Gimenez, J. Reyes
Abstract
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 ΔB=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, (ΔΓBs/ΓBs)(que.)=(5.1+/- 1.9+/- 1.7)10(-2) and (ΔΓBs/ΓBs)(unq.)=(4.3+/- 2.0+/- 1.9)10(-2) from the quenched and unquenched simulations respectively
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