Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-27
Phys.Rev.D76:091702,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
more discussion added; to be published in Phys. Rev. D (Rapid Communications)
Scientific paper
10.1103/PhysRevD.76.091702
We study interactions of unparticles ${\cal {U}}$ of dimension $d_{\cal {U}}$ 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 ${\cal {U}}$, vector ${\cal {U}}$$^\mu$ and spinor ${\cal {U}}$$^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.
Chen Shao-Long
He Xiao-Gang
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