Interactions of Unparticles with Standard Model Particles

TL;DR

This paper explores how unparticles, hypothetical scale-invariant entities beyond the Standard Model, interact with SM particles through effective operators, analyzing their production and detection prospects at colliders.

Contribution

It systematically studies interactions of scalar, vector, and spinor unparticles with SM fields up to dimension four, providing insights into their collider phenomenology.

Findings

Unparticles can be produced at $e^+ e^-$ colliders with distinguishable signatures.

Different unparticle types lead to unique distribution patterns in production cross sections.

The analysis constrains possible unparticle interactions based on gauge invariance and operator dimensions.

Abstract

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.