2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38733A brief review of lattice calculations of the bag parameter B_K relevant for understanding indirect CP violation in the neutral kaon sector is given. A status report on current state-of-the-art calculations is presented as well as a discussion of the value of B_K exported to phenomenologists. This is a condensed and updated version of the review presented at the CKM Unitarity Triangle Workshop held at CERN during Feburary 13-16, 2002 (http://ckm-workshop.web.cern.ch/ckm-workshop/).6 pages. Contribution to CKM Unitarity Triangle Workshop, CERN, 2002High Energy Physics - Latticetext