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Width difference in the Bs system from lattice HQET

arXiv:hep-lat/0009007 · doi:10.1016/S0920-5632(00)01068-9

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 dimension in the HQET for all the ΔB=2 operators, in particular for the operators which enter in the width difference. We obtain for the Bs lifetime difference, (ΔΓ_Bs/Γ_Bs)=(5.1+/- 1.9+/- 1.7)10^(-2).

4 pages, LaTeX. Talk given at International Conference on Hyperons, Charm and Beauty Hadrons, Valencia, Spain, 27-30 Jun 2000. Some misprints corrected. No result changed