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We test the effects of an approximate treatment of two-body contributions tothe axial-vector current on the QRPA matrix elements for neutrinolessdouble-beta decay in a range of isotopes. The form and strength of the two-bodyterms come from chiral effective-field theory. The two-body currents typicallyreduce the matrix elements by about 20%, not as much as in shell-modelcalculations. One reason for the difference is that standard practice in theQRPA is to adjust the strength of the isoscalar pairing interaction toreproduce two-neutrino double-beta decay lifetimes. Another may be the largerQRPA single-particle space. Whatever the reasons, the effects on neutrinolessdecay are significantly less than those on two-neutrino decay, both in theshell model and the QRPA.

Chiral Two-Body Currents and Neutrinoless Double-Beta Decay in the QRPA