Neutral B mixing from 2+1 flavor lattice QCD
- Benedictine U.
- Ohio State U.
- Washington U., St. Louis
- Illinois U., Urbana (main)
- Granada U., Theor. Phys. Astrophys.
- Fermilab
- Glasgow U.
We present an update of the Fermilab-MILC Collaboration's calculation of hadronic matrix elements for B^0-\bar{B^0} mixing. This work is a more extended analysis than our recent publication of the SU(3)-breaking ratio xi [arXiv:1205.7013]. 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 ChPT extrapolation function.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1406333
- Report Number(s):
- arXiv:1212.5470; FERMILAB-CONF-12-606-T; 1208556
- Journal Information:
- PoS, Vol. LATTICE2012; Conference: 30th International Symposium on Lattice Field Theory, Cairns, Australia, 06/24-06/29/2012
- Country of Publication:
- United States
- Language:
- English
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