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We propose improved estimators to compute the reweighting factors which areneeded for lattice QCD calculations that rely on twisted-mass reweighting forthe light quark contribution and the Rational Hybrid Monte Carlo (RHMC)algorithm for non-degenerate quark masses. This is the case for a number ofmodern large-scale simulations based on O(a) improved Wilson fermions. We finda significant reduction of uncertainties for the reweighting factors at similarcomputational cost compared to the conventional estimation. This leads to asignificant increase in precision for phenomenologically relevant observableswith high correlation to the low eigenmodes of the Wilson-Dirac operator in thepresence of exceptionally small eigenvalues.

Low-mode deflation for twisted-mass and RHMC reweighting in lattice QCD