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The various diagrams leading to neutrinoless double beta decay in theleft-right symmetric model have different relative magnitudes, depending on thescale of new physics. Neutrinos acquire mass from both type I and/or type IIseesaw terms, making an unambiguous analysis difficult. We study the half-lifefor double beta decay in the case of type II and type I dominance, in theformer case including interference terms. If the heavy neutrinos of the type Iseesaw model are at the TeV scale, certain processes can be enhanced. Inparticular, there are regions of parameter space in which the so-called lambda-and eta-diagrams can give sizable contributions to the half-life for the decay.We perform a detailed study of one such scenario, paying careful attention toconstraints from lepton flavour violation.

Lepton number and flavour violation in TeV-scale left-right symmetric theories with large left-right mixing