On Unparticles and K+ to pi+ Missing Energy

TL;DR

This paper investigates the decay of K+ to pi+ with missing energy within the unparticle framework, exploring how unparticles can influence decay spectra and interfere with Standard Model processes.

Contribution

It introduces the analysis of K+ decay involving unparticles as missing energy, including interference effects with Standard Model neutrino processes.

Findings

Unparticle contributions can significantly alter the decay spectrum.

Vector unparticles can mediate and interfere with Standard Model decay channels.

The model provides new insights into potential signals of unparticles in kaon decays.

Abstract

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.