2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108691I present some preliminary calculations of B_K on 2+1 flavor domain-wall fermion lattices from the QCDOC, including a set of 16^3x32x8 lattices with a^{-1} near 1.6 GeV. Although a final result awaits the production of a much longer run, I will compare this preliminary value to previous results.6 pages, 5 figures, talk given at Lattice 2005 (Weak Matrix Elements)High Energy Physics - Latticetext