Neutral B-meson mixing from three-flavor lattice quantum chromodynamics: Determination of the SU (3)-breaking ratio ξ

Bazavov, A. et al. (2012) Neutral B-meson mixing from three-flavor lattice quantum chromodynamics: Determination of the SU (3)-breaking ratio ξ. Physical Review D, 86(3), 034503. (doi: 10.1103/PhysRevD.86.034503)

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Abstract

We study SU(3)-breaking effects in the neutral Bd-B⎯⎯⎯d and Bs-B⎯⎯⎯s systems with unquenched Nf=2+1 lattice quantum chromodynamics (QCD). We calculate the relevant matrix elements on the MILC collaboration’s gauge configurations with asqtad-improved staggered sea quarks. For the valence light-quarks (u, d, and s) we use the asqtad action, while for b quarks we use the Fermilab action. We obtain ξ=fBsBBs‾‾‾√/fBdBBd‾‾‾‾√=1.268±0.063. We also present results for the ratio of bag parameters BBs/BBd and the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |Vtd|/|Vts|. Although we focus on the calculation of ξ, the strategy and techniques described here will be employed in future extended studies of the B mixing parameters ΔMd,s and ΔΓd,s in the standard model and beyond.

Item Type:Articles
Additional Information:(Fermilab Lattice and MILC Collaborations).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bouchard, Dr Chris and DeTar, Professor Carleton
Authors: Bazavov, A., Bernard, C., Bouchard, C.M., DeTar, C., Di Pierro, M., El-Khadra, A.X., Evans, R.T., Freeland, E.D., Gámiz, E., Gottlieb, S., Heller, U.M., Hetrick, J.E., Jain, R., Kronfeld, A.S., Laiho, J., Levkova, L., Mackenzie, P..B., Neil, E.T., Oktay, M.B., Simone, J.N., Sugar, R., Toussaint, D., and Van de Water, R.S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:AIP Publishing
ISSN:1550-7998
ISSN (Online):1551-7616

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