Neutral B-meson mixing from three-flavor lattice QCD: Determination of the SU(3)-breaking ratio \xi
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 Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1049400
- Report Number(s):
- FERMILAB-PUB-12-258-PPD; arXiv eprint number arXiv:1205.7013; TRN: US1204823
- Journal Information:
- Physical Review. D, Condensed Matter and Materials Physics, Vol. 86; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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