Experimental Impact of Jet Fragmentation Reference Frames At Particle Colliders

TL;DR

This paper investigates how the choice of reference frame affects jet fragmentation measurements in collider experiments, revealing non-factorizable effects that influence various experimental techniques.

Contribution

It introduces the impact of reference frame choices on jet fragmentation, highlighting non-factorizability and its implications for collider physics analyses.

Findings

Jet fragmentation depends on the reference frame used.

Non-factorizability affects jet tagging and boosted boson measurements.

Simulation predicts significant impact on experimental results.

Abstract

In collider physics, the properties of hadronic jets are often measured as a function of their lab-frame momenta. However, jet fragmentation must occur in a particular rest frame defined by all color-connected particles. Since this frame need not be the lab frame, the fragmentation of a jet depends on the properties of its sibling objects. This non-factorizability of jets has consequences for experimental jet techniques such as jet tagging, boosted boson measurements, and searches for physics Beyond the Standard Model. In this paper, we will describe the effect and show its impact as predicted by simulation.