We give an update on simulation results for the decay constants fB, fBs, fD and fDs. These decay constants are important for precision tests of the standard model, in particular entering as inputs to the global CKM unitarity triangle fit. The results presented here make use of the MILC (2+1)-flavor asqtad ensembles, with heavy quarks incorporated using the clover action with the Fermilab method. Partially quenched, staggered chiral perturbation theory is used to extract the decay constants at the physical point. In addition, we give error projections for a new analysis in progress, based on an extended data set.
|Journal||Proceedings of Science|
|Publication status||Published - 2011|
|Event||29th International Symposium on Lattice Field Theory, Lattice 2011 - Squaw Valley, Lake Tahoe, United States|
Duration: 2011 Jul 10 → 2011 Jul 16
Bibliographical noteFunding Information:
puting Center, and the Los Alamos National Laboratory, which are funded by the Office of Science of the U.S. Department of Energy; and with resources provided by the National Institute for Computational Science, the Pittsburgh Supercomputer Center, the San Diego Supercomputer Center, and the Texas Advanced Computing Center, which are funded through the National Science Foundation’s Teragrid/XSEDE Program. This work was supported in part by the U.S. Department of Energy under Grants No. DE-FC02-06ER41446 (C.D., L.L., M.B.O.), No. DE-FG02-91ER40661 (S.G.), No. DE-FG02-91ER40677 (C.M.B, R.T.E., E.D.F., E.G., R.J., A.X.K.), No. DE-FG02-91ER40628 (C.B), No. DE-FG02-04ER-41298 (D.T.); by the National Science Foundation under Grants No. PHY-0555243, No. PHY-0757333, No. PHY-0703296 (C.D., L.L., M.B.O.), No. PHY-0757035 (R.S.), and No. PHY-0704171 (J.E.H.); by the URA Visiting Scholars’ program (C.M.B., R.T.E., E.G., M.B.O.); and by the Fermilab Fellowship in Theoretical Physics (C.M.B.). This manuscript has been co-authored by employees of Brookhaven Science Associates, LLC, under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
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