2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186818We discuss the implications of new physics, which modifies the matter effect in neutrino oscillations, to long baseline experiments, particularly the MINOS experiment. An analytic formula in the presence of such a new physics interaction is derived for $P(ν_μ\toν_e)$, which is exact in the limit $Δm^2_{21}\to0$.Invited talk at the XXXI International Conference of Theoretical Physics "Matter To The Deepest: Recent Developments In Physics of Fundamental Interactions", Ustron, 5-11 September 2007, Poland. 7 pages (uses appolb.cls), includes 7 figuresHigh Energy Physics - Phenomenologytext