Search for universal extra dimensions in ppbar collisions

TL;DR

This paper searches for Kaluza-Klein particles predicted by universal extra dimension models in proton-antiproton collisions, setting a lower limit on the compactification scale based on muon charge signatures.

Contribution

First search for KK particles in ppbar collisions using same-charge muon pairs, establishing new lower bounds on the UED model parameters.

Findings

Lower limit on compactification scale: R^{-1} > 260 GeV

No evidence of KK particles observed

Constraints improve previous bounds on UED models

Abstract

We present a search for Kaluza-Klein (KK) particles predicted by models with universal extra dimensions (UED) using a data set corresponding to an integrated luminosity of 7.3 fb$^{-1}$, collected by the D0 detector at a $p\bar p$ center of mass energy of 1.96 TeV. The decay chain of KK particles can lead to a final state with two muons of the same charge. This signature is used to set a lower limit on the compactification scale of $R^{-1}>260$ GeV in a minimal UED model.