Unparticle Self-Interactions at the Large Hadron Collider

TL;DR

This paper explores how unparticle self-interactions could produce detectable signals at the LHC, providing bounds and distributions to identify unparticle effects in multi-photon and multi-lepton final states.

Contribution

It introduces the study of unparticle self-interactions via three-point functions and derives new bounds on cross sections for specific multi-particle final states at the LHC.

Findings

Updated upper bounds on unparticle-mediated 4 gamma cross sections

Novel bounds for 2 gamma 2l and 4l final states

Distributions enabling identification of unparticle scaling dimension

Abstract

We investigate the effect of unparticle self-interactions at the Large Hadron Collider (LHC). Especially, we discuss the three-point correlation function, which is determined by conformal symmetry up to a constant, and study its relation to processes with four-particle final states. These processes could be used as a favorable way to look for unparticle physics, and for weak enough couplings to the Standard Model, even the only way. We find updated upper bounds on the cross sections for unparticle-mediated 4 gamma final states at the LHC and novel upper bounds for the corresponding 2 gamma 2l and 4l final states. The size of the allowed cross sections obtained are comparably large for large values of the scaling dimension of the unparticle sector, but they decrease with decreasing values of this parameter. In addition, we present relevant distributions for the different final states, enabling the possible identification of the unparticle scaling dimension if there was to be a large number of events of such final states at the LHC.