2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44343A problem, whether a neutrino-antineutrino transition could be responsible for the muon neutrino deficit found in underground experiments (Super-Kamiokande, MACRO, Soudan 2) and in the accelerator long-baseline K2K experiment, is discussed in this paper. The intention of the work is not consideration of concrete models for muon neutrino-antineutrino transition but a desire to attract an attention to another possibility of understanding the nature of the measured muon neutrino deficit in neutrino experiments.3 pages, no figuresHigh Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Experimenttext