Unparticle Searches Through Compton Scattering

TL;DR

This paper explores how unparticles could influence Compton scattering at future linear colliders, establishing bounds on the unparticle energy scale that are comparable to other physics constraints.

Contribution

It provides the first detailed analysis of unparticle effects on Compton scattering at high-energy colliders, deriving bounds on the unparticle energy scale for various parameters.

Findings

Lambda_U > 80 TeV for d<1.3 at 3 TeV collider energy

Bounds are significant for small d and high energies/luminosities

Results are comparable with other physics constraints

Abstract

We investigate the effects of unparticles on Compton scattering, e gamma -> e gamma based on a future e^+e^- linear collider such as the CLIC. For different polarization configurations, we calculate the lower limits of the unparticle energy scale Lambda_U for a discovery reach at the center of mass energies sqrt(s)=0.5 TeV- 3 TeV. It is shown that, especially, for smaller values of the mass dimension d, (1 <d <1.3), and for high energies and luminosities of the collider these bounds are very significant. As a stringent limit, we find Lambda_U>80 TeV for d<1.3 at sqrt(s)=3 TeV, and 1 ab^(-1) integrated luminosity per year, which is comparable with the limits calculated from other low and high energy physics implications.