251. Neutral B-meson mixing parameters in and beyond the SM with 2+1 flavor lattice QCD
- Author
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Bouchard, C. M., Freeland, E. D., Bernard, C. W., Chang, C. C., El-Khadra, A. X., Gámiz, M. E., Kronfeld, A. S., Laiho, J., and Van de Water, R. S.
- Subjects
High Energy Physics - Lattice ,High Energy Physics - Phenomenology - Abstract
We report on the status of our calculation of the hadronic matrix elements for neutral $B$-meson mixing with asqtad sea and valence light quarks and using the Wilson clover action with the Fermilab interpretation for the $b$ quark. We calculate the matrix elements of all five local operators that contribute to neutral $B$-meson mixing both in and beyond the Standard Model. We use MILC ensembles with $N_f=2+1$ dynamical flavors at four different lattice spacings in the range $a \approx 0.045$--$0.12$~fm, and with light sea-quark masses as low as 0.05 times the physical strange quark mass. We perform a combined chiral-continuum extrapolation including the so-called wrong-spin contributions in simultaneous fits to the matrix elements of the five operators. We present a complete systematic error budget and conclude with an outlook for obtaining final results from this analysis., Comment: 7 pages, 4 figures, presented at the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23-28 June, 2014, Columbia University, New York, NY
- Published
- 2014