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

A. Bazavov, C. Bernard, C. M. Bouchard, C. Detar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, R. Jain, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. MacKenzie, E. T. Neil, M. B. Oktay, J. N. SimoneR. Sugar, D. Toussaint, R. S. Van De Water

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We study SU(3)-breaking effects in the neutral B d-B ̄d and B s-B ̄s systems with unquenched N f=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=f Bs√B Bsf Bd√B Bd=1.268±0.063. We also present results for the ratio of bag parameters B BsB Bd and the ratio of Cabibbo-Kobayashi- Maskawa matrix elements |V td|/|V ts|. 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 ΔM d,s and ΔΓ d,s in the standard model and beyond.

Original languageEnglish (US)
Article number034503
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number3
DOIs
StatePublished - Aug 14 2012
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    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., ... Van De Water, R. S. (2012). Neutral B-meson mixing from three-flavor lattice quantum chromodynamics: Determination of the SU(3)-breaking ratio ξ. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(3), [034503]. https://doi.org/10.1103/PhysRevD.86.034503