Jet substructure measurements elucidating partonic evolution in $p$+$p$ collisions at RHIC

TL;DR

This paper presents measurements of jet substructure observables in proton-proton collisions at RHIC, providing insights into partonic evolution and hadronization mechanisms through comparisons with QCD predictions.

Contribution

It introduces new measurements of SoftDrop and N-Point Energy Correlators in $p$+$p$ collisions at 200 GeV, connecting experimental data to fundamental QCD processes.

Findings

SoftDrop observables vary with jet momentum and radius

ENCs reveal details of parton evolution and hadronization

Charge-weighted ENC offers additional hadronization insights

Abstract

Jets are multiscale objects that connect partons to hadrons, making jet substructure measurements crucial for probing both perturbative and non-perturbative processes in QCD. At STAR, a variety of jet substructure observables, such as SoftDrop groomed splittings and N-Point Energy Correlators (ENC), provide insights into parton evolution and hadronization mechanisms. SoftDrop-groomed observables and ENCs both connect measurement to fundamental QCD at the parton level, allowing for comparisons to first-principles theoretical calculations. Additionally, by also including charge information, as in the charge-weighted ENC, details about the hadronization mechanism can be obtained. In these proceedings, we present preliminary results on measurements of SoftDrop observables and ENCs across different jet momenta and radii in $p$+$p$ collisions at $\sqrt{s}$~=~200~GeV using STAR data.