Work

Unparticle effects in photon–photon scattering

Year: 2008

Type: article

Abstract: Elastic photon–photon scattering can occur in the Standard Model only via loop diagrams and is naturally suppressed. Unparticle can induce tree-level photon–photon scattering through the operator FμνFμνOU for spin-0 unparticle or FμαFανOUμν for spin-2 unparticle. Due to the peculiar CP-conserving phase exp(−idUπ) associated with the time-like unparticle propagator for non-integral scaling dimension dU, the interference effects of the s-channel amplitude with the t- and u-channels ones on the total cross sections as well as the angular distributions are found to be of some significance. We found that the matrix-element squared is independent of whether we used the transverse form or the conformal form for the spin-2 unparticle propagator. In addition, we show that the cross sections via unparticle exchange can be substantially larger than the Standard Model contribution.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2008.05.039

Authors: Chun-Fu Chang, Kingman Cheung, Tzu-Chiang Yuan

Institutions: National Tsing Hua University, National Center for Theoretical Sciences, Physics Division

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid:

Funders: National Center for Theoretical Sciences, National Science Council