Eur. Phys. J. C (2008) 56: 279-285
https://doi.org/10.1140/epjc/s10052-008-0658-7

Regular Article - Theoretical Physics

Unparticle searches through gamma–gamma scattering

¹ Department of Physics, Fakulty of Sciences, Ankara University, 06100, Tandogan, Ankara, Turkey
² Department of Physics, University of Wisconsin, Madison, WI, 53706, USA

^* e-mail: ocakir@science.ankara.edu.tr

Received: 28 April 2008
Revised: 21 May 2008
Published online: 2 July 2008

Abstract

We investigate the effects of unparticles on γγ→γγ scattering for the photon collider mode of the future multi-TeV e⁺e^- linear collider. We show the effects of unparticles on the differential, and total scattering cross sections for different polarization configurations. Considering 1-loop standard model background contributions from the charged fermions and W^± bosons to the cross section, we calculate the upper limits on the unparticle couplings λ₀ to the photons for various values of the scaling dimension d (1<d<2) at = 0.5–5 TeV.