2012/12/21 by E. D. Freeland, C. M. Bouchard, Freeland, E. D. +18 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat
paper · pdf · doi:10.48550/arxiv.1212.5470
7 pages, 2 figures; Proceedings of the 30th International Symposium on Lattice Field Theory, June 24-29, 2012, Cairns, Australia
arxiv created 2012/12/21 · arxiv updated 2012/12/24
We present an update of the Fermilab-MILC Collaboration's calculation of hadronic matrix elements for B0-B0 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.