Unparticle Self-Interactions and Their Collider Implications

TL;DR

This paper explores the self-interactions of unparticles, revealing they can produce striking collider signals at the LHC, potentially serving as a key discovery avenue for unparticle physics.

Contribution

It demonstrates that unparticle self-interactions, determined by conformal symmetry, can lead to observable collider signatures with significant cross sections, highlighting their experimental importance.

Findings

Collider signals with cross sections of picobarns or larger.

Self-interactions mediated processes like $pp -> U -> UU$ leading to multi-gamma and multi-Z final states.

Potential for unparticle self-interactions to be the main discovery channel.

Abstract

In unparticle physics, operators of the conformal sector have self-interactions, and these are unsuppressed for strong coupling. The 3-point interactions are completely determined by conformal symmetry, up to a constant. We do not know of any theoretical upper bounds on this constant. Imposing current experimental constraints, we find that these interactions mediate spectacular collider signals, such as $pp -> U -> UU -> \gamma \gamma \gamma \gamma$, $\gamma \gamma ZZ$, $ZZZZ$, $\gamma \gamma l^+ l^-$, $ZZ l^+ l^-$, and $4l$, with cross sections of picobarns or larger at the Large Hadron Collider. Self-interactions may therefore provide the leading discovery prospects for unparticle physics.