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We examine the leading effects of two-body weak currents from chiraleffective field theory on the matrix elements governing neutrinolessdouble-beta decay. In the closure approximation these effects are generated bythe product of a one-body current with a two-body current, yielding both two-and three-body operators. When the three-body operators are considered withoutapproximation, they quench matrix elements by about 10%, less than suggested byprior work, which neglected portions of the operators. The two-body operators,when treated in the standard way, can produce much larger quenching. In aconsistent effective field theory, however, these large effects becomedivergent and must be renormalized by a contact operator, the coefficient ofwhich we cannot determine at present.

Quenching of nuclear matrix elements for $0\nu\beta\beta$ decay by chiral two-body currents