Interactions of Unparticles with Standard Model Particles

Abstract

We study interactions of unparticles $\mathcal{U}$ of dimension $d_{\mathcal{U}}$ due to Georgi with Standard Model (SM) fields through effective operators. The unparticles describe the low energy physics of a non-trivial scale invariant sector. Since unparticles come from beyond the SM physics, it is plausible that they transform as a singlet under the SM gauge group. This helps tremendously in limiting possible interactions. We analyze interactions of scalar $\mathcal{U}$, vector $\mathcal{U}$${}^{\mu }$ and spinor $\mathcal{U}$${}^s$ unparticles with SM fields and derivatives up to dimension four. Using these operators, we discuss different features of producing unparticles at $e^{+}{e}^{-}$ collider and other phenomenologies. It is possible to distinguish different unparticles produced at $e^{+}{e}^{-}$ collider by looking at various distributions of production cross sections.

more discussion added; to be published in Phys. Rev. D (Rapid Communications)

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