Abstract
Recent progress in lattice QCD has been characterised by significant improvements in the algorithms for simulating dynamical fermions, leading to numerical simulations that run now closer to the physical quark masses and with a variety of fermionic discretizations. In this paper we focus on two aspects that have been studied recently. The latest results obtained for the low-energy constants extract from fitting lattice data to chiral perturbation theory. Sources of systematic errors are emphasized, and results from different collaborations are compared by plotting adimensional ratios that should fall on a universal curve as the continuum limit is approached. We also report on recent results for the parameter BK which encodes the nonperturbative contribution to indirect CP violation in kaon mixing.
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