Abstract

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BK on 2+1-flavor Iwasaki DWF lattices

Presenter: Saul Cohen — Jefferson Lab

Saul D. Cohen for the RBC and UKQCD Collaborations

We present the final results of the RBC/UKQCD calculation of BK on 2+1-flavor domain-wall fermion lattices at a−1 = 1.62 GeV. Our lattices have length about 3 fm and lightest valence pion about 230 MeV. The light pion masses and our chiral fermion action allow us to compare lattice data to NLO chiral perturbation theory. We present a final result including nonperturbative renormalization and detailed systematic errors and briefly assess the impact of our new data on the determination of the apex of the unitarity triangle.