Coulomb gluons will generally destroy coherence

TL;DR

This paper investigates how Coulomb gluons cause coherence violation in QCD, showing that most soft radiation-sensitive observables at hadron colliders experience some degree of coherence breakdown, with specific analysis on gaps-between-jets.

Contribution

It provides a detailed analysis of the conditions leading to coherence violation in QCD and generalizes the phenomenon across various observables, including precise logarithmic order statements.

Findings

Almost all soft radiation observables at hadron colliders violate coherence.

Coherence violation can be super-leading in certain observables like gaps-between-jets.

The paper generalizes the understanding of coherence violation to multiple observables.

Abstract

Coherence violation is an interesting and counter-intuitive phenomenon in QCD. We discuss the circumstances under which violation occurs in observables sensitive to soft radiation and arrive at the conclusion that almost all such observables at hadron colliders will violate coherence to some degree. We illustrate our discussion by considering the gaps-between-jets observable, where coherence violation is super-leading, then we generalise to other observables, including precise statements on the logarithmic order of coherence violation.