Axigluon signatures at hadron colliders

TL;DR

This paper investigates axigluons, hypothetical particles predicted by certain theories, focusing on their signatures in top-antitop quark production asymmetries at hadron colliders, providing updated limits and new observables for detection.

Contribution

It introduces a more sensitive observable for axigluon detection and updates mass limits using recent asymmetry measurements at Tevatron and LHC.

Findings

Lower limit of 1.4 TeV on axigluon mass from Tevatron data

New observable more sensitive to axigluons than traditional asymmetry measures

Charge asymmetry at LHC can probe higher axigluon masses than dijet mass distribution

Abstract

Axigluons are colored heavy neutral gauge boson that are predicted by some theories. The most important model-independent manifestation of axigluons is the generation of a forward--backward asymmetry in top-antitop quark production at $p\bar{p}$ collisions which originates from the charge asymmetry. We update our previous analysis for the inclusive QCD induced forward--backward asymmetry and define a new observable which is more sensitive to the effect than the forward--backward asymmetry. We find a lower limit of 1.4 TeV at 90% C.L. on the axigluon mass from recent measurements of the asymmetry at Tevatron, and extend the analysis to LHC in suitably selected samples. Like at Tevatron, the charge asymmetry can probe larger values of the axigluon mass than the dijet mass distribution.