2019

A Theory of Quark vs. Gluon Discrimination

Larkoski, Andrew J., Metodiev, Eric M.

Understand

Understanding jets initiated by quarks and gluons is of fundamental importance in collider physics.

Efficient and robust techniques for quark versus gluon jet discrimination have consequences for new physics searches, precision $\alpha_s$ studies, parton distribution function extractions, and many other applications.
Numerous machine learning analyses have attacked the problem, demonstrating that good performance can be obtained but generally not providing an understanding for what properties of the jets are responsible for that separation power.
In this paper, we provide an extensive and detailed analysis of quark versus gluon discrimination from first-principles theoretical calculations.

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