Probing the Gauge Content of Heavy Resonances with Soft Radiation

TL;DR

This paper explores how soft gluon radiation patterns can reveal the gauge group representation of new heavy resonances, providing a diagnostic tool to distinguish between different color states in high-energy physics.

Contribution

It introduces a method using energy flow and soft radiation patterns, including a soft anomalous dimension matrix, to identify the gauge content of heavy resonances in collider experiments.

Findings

Radiation patterns differ significantly between singlet and octet resonances.

Quantitative differences are especially pronounced for spin-1 resonances.

Soft radiation is more extensive for singlet resonances than for octet ones.

Abstract

The use of energy flow is investigated as a diagnostic tool for determining the color SU(3) representation of new resonances. It is found that the pattern of soft gluon radiation into a rapidity gap depends on color flow in the hard scattering, and reflects the gauge content of new physics. The massive soft anomalous dimension matrix for rapidity gap events is introduced for describing soft gluon emission analytically in heavy quark pair production. A gap fraction is used for quantifying the amount of soft radiation into the gap region. In general, the results illustrate that radiation is greater for a singlet resonance than for an octet. Especially, it is found that the quantitative difference is quite distinguishable for spin-1 resonances, depending on the gauge content in the new sector.