Neutral weak current two-body contributions in inclusive scattering from 12C.
An ab initio calculation of the sum rules of the neutral weak response functions in 12C is reported, based on a realistic Hamiltonian, including two- and three-nucleon potentials, and on realistic currents, consisting of one- and two-body terms.  We find that the sum rules of the response functions associated with the longitudinal and transverse components of the (spacelike) neutral current are largest and that a significant portion (≃30%) of the calculated strength is due to two-body terms.  This fact may have implications for the MiniBooNE and other neutrino quasielastic scattering data on nuclei.