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In this work we study the short-range contributions that induce effectivelepton number violating (LNV) interactions. We obtain a full set of constraintson the effective short-range couplings from a large variety of low-energy$|\Delta L|= 2$ processes of pseudoscalar mesons $K, D, D_s, B$, and$\tau$-lepton. These constraints provide complementary and additionalinformation to the one obtained from the neutrinoless double-$\beta$($0\nu\beta\beta$) decay. As expected, the bounds on electron-electronshort-range couplings are the only ones that are strongly constrained by the$0\nu\beta\beta$ decay. Although weaker, LNV effective couplings with differentflavours are not accessible to $0\nu\beta\beta$ decay and these can be probe bythe $|\Delta L|= 2$ processes in consideration.

Constraints on lepton number violating short-range interactions from $|\Delta L|=2$ processes