Jet fragmentation and gauge/string duality

TL;DR

This paper explores jet fragmentation in gauge theories with a dual string description, analyzing the scale dependence of fragmentation functions and the effects of strong coupling on particle multiplicity and spectrum shape.

Contribution

It introduces a framework for understanding jet fragmentation in gauge/string duality, including the construction of the timelike anomalous dimension at strong coupling.

Findings

Average multiplicity grows linearly with energy at infinite 't Hooft coupling.

Inclusive spectrum peaks at the kinematical boundary.

Provides insights into jet behavior in strongly coupled gauge theories.

Abstract

We consider an analog of e^+e^- annihilation in gauge theories which have a dual string description in asymptotically AdS_5 space and discuss the nature of jet fragmentation. We construct the timelike anomalous dimension which governs the scale dependence of the fragmentation function. In the limit of infinite 't Hooft coupling, the average multiplicity rises linearly with the energy and the inclusive spectrum is peaked at the kinematical boundary.