2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144848We analyze the branching ratio and spectrum for the decay mode $K^+ \toπ^++{\not}E$(missing energy) in the unparticle model, where an unparticle can also serve as the missing energy. A vector unparticle can even mediate the $K^+ \to π^+ +ν\barν$, resulting complicated interference with the Standard Model.13 pages, 10 figuresHigh Energy Physics - Phenomenologytext