Closing the Low-mass Axigluon Window

TL;DR

This paper reviews the current experimental constraints on low-mass axigluons, a hypothetical particle predicted by certain models, highlighting the mass ranges excluded by collider and decay experiments, and identifying the remaining viable window.

Contribution

It compiles and analyzes existing experimental data to delineate the allowed mass window for low-mass axigluons, providing a comprehensive status update.

Findings

Upsilon decays exclude axigluons up to 25 GeV.

e+e- measurements exclude axigluons up to 50 GeV.

LEP data rules out axigluons below 365 GeV.

Abstract

In this report, I will present the current status of the low-mass axigluon. The axigluon is a massive, color octet, axial vector boson, predicted in, e.g., chiral color models and some technicolor models, with a mass of order the electroweak scale. Axigluons with a mass larger than about 125 GeV to nearly 1 TeV can be eliminated by di-jet production at hadron colliders like the TEVATRON, but a low-mass window exists that the di-jet search can not probe. Upsilon decays can rule out axigluons with a mass up to 25 GeV, and low energy e^+ e^- (PEP and PETRA) can rule out axigluons with a mass up to 50 GeV using a measurement of R. Top production at the TEVATRON disfavors a light axigluon. A measurement of R at LEP strongly disfavors a light axigluon, and rules out an axigluon with mass < 365 GeV.