  The quasielastic cross-section of charged-current neutrino and antineutrino
scattering on $^{12}$C is calculated using an improved superscaling model with
relativistic effective mass. Our model encompasses two-particle emission
induced by neutrinos, which we distinguish into two contributions. The first
contribution arises from meson-exchange currents, and its calculation is
performed at a microscopic level. The second contribution is phenomenological
and extracted from the high-energy tail of the scaling function, assumed to be
produced by 2p2h mechanisms where the one-body current plays a role, such as
short-range correlations and interferences with MEC, final-state interaction,
etc. The model explicitly includes the modification of the relativistic
effective mass of the nucleon within the relativistic mean field model of
nuclear matter. The meson exchange currents are also consistently calculated
within the same model. With this model, we present predictions for the neutrino
and antineutrino cross sections of $^{12}$C that have been measured in
accelerator experiments.
