arXiv:hep-lat/0212015·v1·High Energy Physics — Lattice
B_K from quenched overlap QCD
N. Garron (1)🇫🇷 · L. Giusti (1,2)🇫🇷 · C. Hoelbling (1)🇫🇷 · L. Lellouch (1)🇫🇷 · C. Rebbi (3) ((1) CPT Marseille, (2) CERN, (3) Boston University)🇺🇸
Abstract
We present an exploratory calculation of the standard model Delta S=2 matrix element relevant for indirect CP violation in K -> pi pi decays. The computation is performed with overlap fermions in the quenched approximation at beta=6.0 on a 16^3x32 lattice. The resulting bare matrix element is renormalized non-perturbatively. Our preliminary result is B_K^{NDR}(2 GeV)=0.61(7), where the error does not yet include an estimate of systematic uncertainties.
Comments: 3 pages, 2 figures, Lattice2002(matrixel). Parallel session talk by L. Lellouch at the 20th International Symposium on Lattice Field Theory (Lattice 2002), Boston, Massachusetts, 24-29 June 2002