Related Experiment Video
Updated: Aug 2, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
B(0)-B(0) mixing in unquenched lattice QCD
S Aoki1, M Fukugita, S Hashimoto
1Institute of Physics, University of Tsukuba, Tsukuba 305-8571, Japan.
Abstract:
We present an unquenched lattice calculation for the B(0)-B(0) transition amplitude. The calculation, carried out at an inverse lattice spacing 1/a=2.22(4) GeV, incorporates two flavors of dynamical quarks described by the O(a)-improved Wilson fermion action and heavy quarks described by nonrelativistic QCD. Particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay constant, whereas it is small for the B parameters. We obtain f(B(d))=191(10)(+12-22) MeV, f(B(s))/f(B(d))=1.13(3)(+13-2), B(B(d))(m(b))=0.836(27)(+56-62), B(B(s))/B(B(d))=1.017(16)(+56-17), and xi=1.14(3)(+13-2), where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion, and perturbative operator matching.
Related Concept Videos
Trends in Lattice Energy: Ion Size and Charge
Reaction Quotient
Lattice Centering and Coordination Number
Types of Unit Cells
Imagine taking a large number of identical...
Second Uniqueness Theorem
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
The Thermodynamics of Mixing
Lattice Energies of Ionic Crystals

