Abstract
We consider rho meson contributions to neutrinoless double beta decay amplitude stemming from the hadronization of the short distance quark-electron currents. These contributions are evaluated within vacuum dominance approximation. The one and two rho exchange contributions affect the Fermi transition nuclear matrix element in a way that lead to near cancellations in the same chirality, left–left and right–right, short range amplitudes when these new contributions are combined with the conventional short range amplitudes, while the left–right amplitude almost triples. A rough estimate comparing this contribution to the long range pion exchange contribution indicates that rho exchange contribution can easily be mathcal {O}(10%) of the pion contribution. When considering precision predictions, rho exchange amplitudes should be included in any phenomenological study, like in left–right theories.
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