Unparticle as a particle with arbitrary mass

TL;DR

This paper explores the concept of unparticles, showing that they can be viewed as particles with a continuous mass spectrum that appear as particles with definite mass upon measurement.

Contribution

It demonstrates that unparticles can be represented as particles with arbitrary mass, bridging the gap between unparticle theory and particle physics.

Findings

Unparticles can be expanded in terms of operators with continuous mass spectrum.

Measurement of 4-momentum reveals unparticles as particles with definite mass.

Unparticles manifest as ordinary particles with arbitrary mass upon observation.

Abstract

The unparticle field operator can be expanded in terms of creation and destruction operators corresponding to particles with a continuous mass spectrum. Hence, when the 4-momentum of an unparticle is measured, then the unparticle manifests as an ordinary particle with a definite (but arbitrary) mass.