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Quenched and first unquenched lattice HQET determination of the B-s-meson width difference

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Quenched and first unquenched lattice HQET determination of the B-s-meson width difference

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Giménez Gómez, Vicente; Reyes Gámez, Juan

Aquest document és un/a article, creat/da en: 2001

We present recent results for the prediction of the B-s(0)-(B) over bar (0)(s) 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 DeltaB=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 B-s(0)-(B) over bar (0)(s) lifetime difference, Delta Gamma (Bs)/Gamma ((que.))(Bs) = (5.1 +/- 1.9 +/- 1.7) x 10(-2) and Delta Gamma (Bs)/Gamma ((unq))(Bs) = (4.3 +/- 2.0 +/- 1.9) x 10(-2) from the quenched and unquenched simulations respectively.

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