STAR HardProbes PWG

[Andrew Tamis <andrew.tamis AT yale.edu>]

Hi all,

I would like to submit an abstract for QM2023.  My presentation will include my p+p measurement of EECs, and I have several possible ideas for extensions in that dataset, or a possible extension into Heavy ion if there is time.  I have provided a slightly modified version of my HP abstract as an outline: I will update on an exact plan in the coming days after discussing internally.

Jet substructure is a powerful tool to probe the time evolution of a parton shower.  A substructure observable with growing theoretical and experimental interest, the 2-point Energy Correlator (EEC), re-contextualizes jet substructure study by using the distribution of angular distance of all combinations of two final state particles within a jet. This distribution is weighted by the product of the fractions of jet energy that each of the constituents carry, and thus is infrared-and-collinear safe. The EEC can cleanly reveal the separation between two distinct regimes: effects originating from free hadrons at small opening angles and from perturbative fragmentation of quarks and gluons at large opening angles.

In this talk, the first fully corrected measurement of the EEC at RHIC is presented, using the data taken at sqrt(s) = 200 GeV p+p collisions by STAR. The EEC will be shown for several full jet p_{T} selections and compared to predictions from the PYTHIA-8 Detroit tune. This work will be useful as a baseline for comparisons to future studies in heavy-ion systems, which will provide information about how the quark-gluon plasma interacts with the jet across different angular and time scales.

Best,

Andrew

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Andrew Tamis

Yale University

Graduate School of Arts and Sciences

Department of Physics

andrew.tamis AT yale.edu