Analysis of the MINERvA antineutrino double-differential cross sections within the SuSAv2 model including meson-exchange currents

We compare the results of the SuSAv2 model including meson-exchange currents (MEC) with the recent measurement of the quasielasticlike double differential antineutrino cross section on a hydrocarbon performed by the MINERvA Collaboration [C. E. Patrick et al. (MINERvA Collaboration), Phys. Rev. D 97, 052002 (2018)]. The relativistic nature of the model makes it suitable to describe these data, which correspond to a mean beam energy of 3.5 GeV. The standard SuSAv2 model predictions agree well with the data without needing any additional or tuned parameter. The role of longitudinal MEC is non-negligible and improves the agreement with the data. We also consider the impact of different treatments of the Δ-resonance propagator in the two-body currents on the data comparison.