Neutral B-meson mixing from three-flavor lattice QCD: Determination of the SU(3)-breaking ratio \xi

Journal Article · Tue May 01 04:00:00 EDT 2012 · Physical Review. D, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevD.86.034503· OSTI ID:1049400

Bazavov, A; Bernard, C; Bouchard, C M; DeTar, C; Di Pierro, M; El-Khadra, A X; Evans, R T; Freeland, E D; Gamiz, E; Gottlieb, Steven; Heller, U M

We study SU(3)-breaking effects in the neutral B{sub d}-{bar B}{sub d} and B{sub s}-{bar B}{sub s} systems with unquenched N{sub t}=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 {xi}=f{sub B{sub s}} {radical}{ovr B{sub B{sub s}}}/f{sub B{sub d}}{radical}{ovr B{sub B{sub d}}}=1.268{+-}0.063. We also present results for the ratio of bag parameters B{sub B{sub s}}/B{sub B{sub d}} and the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |V{sub td}|/|V{sub ts}|. Although we focus on the calculation of {xi}, the strategy and techniques described here will be employed in future extended studies of the B mixing parameters {Delta}M{sub d,s} and {Delta}{Gamma}{sub d,s} in the standard model and beyond.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: DOE Office of Science
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1049400
• Report Number(s): FERMILAB-PUB-12-258-PPD; arXiv eprint number arXiv:1205.7013
• Journal Information: Physical Review. D, Condensed Matter and Materials Physics, Journal Name: Physical Review. D, Condensed Matter and Materials Physics Vol. 86; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
FERMILAB
Lattice
MATRIX ELEMENTS
MIXING
QUANTUM CHROMODYNAMICS
QUARKS
STANDARD MODEL
SU-3 GROUPS
SYMMETRY BREAKING
VALENCE