2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43364As a possible approach to the neutrino oscillation on the basis of quantum field theory, the expectation values of the flavor-neutrino currents are investigated by employing the finite-time transition matrix in the interaction representation. Such expectation values give us in the simplest form a possible way of treating the neutrino oscillation without recourse to any one flavor-neutrino states. The present paper is devoted to presenting the formulation and the main structures of the relevant expectation values.31 pages, 12 figuresHigh Energy Physics - Phenomenologytext