The Dirac Majorana Confusion Theorem in the Presence of Flavor-Changing Neutral Currents: A CP-Filter Mechanism

Abstract

The Practical Dirac Majorana Confusion Theorem(PDMCT) asserts that phenomenological differences between Dirac and Majorana neutrinos are kinematically suppressed by (neutrino mass/E)^2 in lepton number conserving processes. The PDMCT relies on standard lefthanded neutrino interactions, as in the SM, in which case Dirac and Majorana neutrinos are experimentally indistinguishable in lepton-number-conserving processes. Our scenario explicitly goes beyond these assumptions by introducing a neutral vector boson Zprime with CP-violating, flavor changing neutral current (FCNC) couplings, which generate observable Dirac Majorana differences while remaining fully consistent with the PDMCT. In strict accordance with the PDMCT, Fermi Dirac statistics dictate that the flavor-diagonal vector current identically vanishes for Majorana neutrinos.For non diagonal transitions, the Majorana condition strictly forbids the real (CP conserving) component of the vector interaction, leaving only a imaginary coupling. As a consequence, the observable difference in inclusive scattering cross-sections between Dirac and Majorana neutrinos is driven entirely by the FCNC CP-violating couplings. We apply these results to Coherent Elastic Neutrino-Nucleus Scattering (CEnuNS), showing that for spin-zero targets, the distinguishability of the neutrino's nature is determined by the CP structure of the new interaction.