Weak neutral currents and the Hiroshima model

A possible feature of weak neutral currents is investigated on the basis of the Hiroshima model, in which neutral hadron currents follow from lepton currents without assuming existence of neutral lepton currents. Neutral hadron currents depend not only on the models of urbaryon (the Hiroshima model and the new Nagoya model) but also on the models of hadron (the quark model and the quartet model). Moreover, those depend on the choice of forms of pure leptonic weak interaction. Cross sections for elastic νN scattering are predicted.