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arXiv · 2507.23610

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

Monika Robotkova
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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.

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Monika Robotkova. 2025-07-31. Jet substructure measurements elucidating partonic evolution in $p$+$p$ collisions at RHIC. https://arxiv.org/abs/2507.23610

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