On Unparticles and K+ to pi+ Missing Energy

We analyze the branching ratio and spectrum for the decay mode $K^+ \to\pi^++{\not}E$(missing energy) in the unparticle model, where an unparticle can also serve as the missing energy. A vector unparticle can even mediate the $K^{+}\to {\pi }^{+}+\nu \bar{\nu }$, resulting complicated interference with the Standard Model.