Unparticle effects in photon-photon scattering

Abstract

Elastic photon-photon scattering can only occur via loop diagrams in the standard model and is naturally suppressed. Unparticle can induce tree-level photon-photon scattering through the operator F_{μν} F^{μν} O_\U for spin-0 unparticle or F_{μα} F^α_ν O^{μν}_\U for spin-2 unparticle. Due to the peculiar CP-conserving phase \exp(-i d_\U π) associated with the s-channel unparticle propagator, its interference effects with the t- and u-channels on the total cross section and the angular distribution are found to be some significance. In addition, we show that the cross sections via unparticle exchange can be substantially larger than the standard model contribution.

8 pages, 2 figures

References in corpus (10)

• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• Collider signals in unparticle physics
• Photon-Photon Scattering at the Photon Linear Collider
• Single Top-Quark Production in Flavor-Changing Z' Models
• The gamma gamma to gamma gamma process in the Standard and SUSY models at high energies
• Diphoton signals for Low Scale Gravity in Extra Dimensions
• SUSY Unparticle and Conformal Sequestering
• gamma gamma -> gamma gamma as a Test of Weak Scale Quantum Gravity at the NLC
• Production of $Z$ Boson Pairs at Photon Linear Colliders

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• Unparticle physics at the photon collider
• Unparticle-Induced Lepton Flavor Violating Decays τ^- ->l^- (V^0, ~P^0)
• Muon Anomalous Magnetic Moment and Lepton Flavor Violating Tau Decay in Unparticle Physics
• Unparticle effects on cosmic ray photon and $e^{\pm }$