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We present the results of a recent study of meson-exchange two-body currentsin lepton-nucleus inclusive scattering at various kinematics and for differentnuclei within the Relativistic Fermi Gas model. We show that the associatednuclear response functions at their peaks scale as $A k_F^2$, for Fermimomentum $k_F$ going from 200 to 300 MeV/c and momentum transfer $q$ from$2k_F$ to 2 GeV/c. This behavior is different from what is found for thequasielastic response, which scales as $A/k_F$. This result can be valuable inthe analyses of long-baseline neutrino oscillation experiments, which need toimplement these nuclear effects in Monte Carlo simulations for differentkinematics and nuclear targets.

Nuclear dependence of the 2p2h electroweak response in the Relativistic Fermi Gas model