Neutral B mixing from 2+1 flavor lattice QCD

E. D. Freeland, C. M. Bouchard, C. Bernard, A. X. El-Khadra, E. Gámiz, A. S. Kronfeld, John W Laiho, R. S. Van De Water

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We present an update of the Fermilab-MILC Collaboration's calculation of hadronic matrix elements for B0-B-0 mixing. This work is a more extended analysis than our recent publication of the SU(3)-breaking ratio x [1]. We use the asqtad staggered action for light valence quarks in combination with the Fermilab interpretation of the Sheikoleslami-Wohlert action for heavy quarks. The calculations use MILC's 2+1 flavor asqtad ensembles. Ensembles include four lattice spacings from approximately 0.125 fm to 0.045 fm and up/down to strange quark mass ratios as low as 0.05. Our calculation covers the complete set of five operators needed to describe B mixing in the Standard Model and beyond. In addition to an update including a fuller set of analyzed data, we comment on the form of the staggered cPT extrapolation function.

Original languageEnglish (US)
Article number107
JournalProceedings of Science
VolumePart F130497
StatePublished - 2012
Externally publishedYes

ASJC Scopus subject areas

  • General

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    Freeland, E. D., Bouchard, C. M., Bernard, C., El-Khadra, A. X., Gámiz, E., Kronfeld, A. S., Laiho, J. W., & Van De Water, R. S. (2012). Neutral B mixing from 2+1 flavor lattice QCD. Proceedings of Science, Part F130497, [107].