Relativistic effects in two-particle emission for electron and neutrino reactions

Understand

Two-particle two-hole contributions to electroweak response functions are computed in a fully relativistic Fermi gas, assuming that the electroweak current matrix elements are independent of the kinematics.

• We analyze the genuine kinematical and relativistic effects before including a realistic meson-exchange current (MEC) operator.
• This allows one to study the mathematical properties of the non-trivial seven-dimensional integrals appearing in the calculation and to design an optimal numerical procedure to reduce the computation time.
• This is required for practical applications to CC neutrino scattering experiments, where an additional integral over the neutrino flux is performed.