We compute the hadronic matrix elements of the complete set of local four-quark operators relevant for neutral B-meson mixing in the Standard Model and beyond as well as for the the shortdistance contributions to D0 mixing. In addition we calculate the leptonic decay constants for the B-And D-meson systems on the same sets of gauge-field ensembles. Both mixing matrix elements and decay constants are computed with asqtad-improved light quarks and clover heavy quarks in the Fermilab interpretation. We use the MILC three-flavor asqtad ensembles at four lattice spacings between appoximately 0:11 fm and 0:043 fm. We present nearly final values for the mixing matrix elements, and find for the SU(3) breaking ratio ξ = 1:203(17)(6)seac . The second error accounts for the omission of charm quarks in the sea while the first error includes all other sources of uncertainty. Our result for ξ when combined with the experimentally measured frequencies gives jVtdj /Vts/ = 0:2047(4)exp(29)th(10)seac. Finally, we report on our progress towards finalizing our decay constant and bag parameter analyses.
|Proceedings of Science
|Published - 2015
|33rd International Symposium on Lattice Field Theory, LATTICE 2015 - Kobe, Japan
Duration: Jul 14 2015 → Jul 18 2015
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