Relativistic model of 2p-2h meson exchange currents in (anti)neutrino scattering
Relativistic model of 2p-2h meson exchange currents in (anti)neutrino scattering
We develop a model of relativistic, charged meson-exchange currents (MEC) for neutrino-nucleus interactions. The two-body current is the sum of seagull, pion-in-flight, pion-pole and $\Delta$-pole operators. These operators are obtained from the weak pion-production amplitudes for the nucleon derived in the non-linear $\sigma$-model together with weak excitation of the $\Delta(1232)$ …