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At stronger gauge-field couplings, the domain wall fermion (DWF) residualmass, a measure of chiral symmetry breaking, grows rapidly. This measure islargely due to near zero fermion eigenmodes of logarithm of the 4D transfermatrix along the fifth dimension, and these eigenmodes increase rapidly atstrong coupling. To suppress these eigenmodes, we have added to the DWF pathintegral a multiplicative weighting factor consisting of a ratio ofdeterminants of Wilson-Dirac fermions having a chirally twisted mass with alarge negative real component and a small imaginary chiral component. Numericalresults show that this weighting factor with an appropriate choice of twistedmasses significantly suppresses the residual mass while allowing adequatetopological tunneling.

Controlling Residual Chiral Symmetry Breaking in Domain Wall Fermion Simulations