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Measurement of Two-Point Energy Correlators Within Jets in $p$+$p$ Collisions at $\sqrt{s}$ = 200 GeV

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arxiv 2502.15925 v1 pith:IKZD4QFE submitted 2025-02-21 hep-ex

classification hep-ex
keywords collisionshadronizationjetsparticlesenergymeasurementnon-perturbativepairs
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Hard-scattered partons ejected from high-energy proton-proton collisions undergo parton shower and hadronization, resulting in collimated collections of particles that are clustered into jets. A substructure observable that highlights the transition between the perturbative and non-perturbative regimes of jet evolution in terms of the angle between two particles is the two-point energy correlator (EEC). In this letter, the first measurement of the EEC at RHIC is presented, using data taken from 200 GeV $p$+$p$ collisions by the STAR experiment. The EEC is measured both for all the pairs of particles in jets and separately for pairs with like and opposite electric charges. These measurements demonstrate that the transition between perturbative and non-perturbative effects occurs within an angular region that is consistent with expectations of a universal hadronization regime that scales with jet momentum. Additionally, a deviation from Monte-Carlo predictions at small angles in the charge-selected sample could result from mechanics of hadronization not fully captured by current models.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Jet-by-jet energy correlators as stochastic probes of the parton-to-hadron transition

    hep-ph 2026-08 conditional novelty 6.0 of 10

    Per-jet fluctuations of binned energy-energy correlators show a smaller covariance trace and larger neighboring-shell correlations at hadron level than at parton level in Pythia and Herwig across all tested configurations.

  2. Energy-energy correlators inside single inclusive jets in heavy-ion collisions with CoLBT-hydro model

    hep-ph 2026-05 unverdicted novelty 6.0 of 10

    Updated CoLBT-hydro simulations with Q_M=2.0 GeV reproduce CMS in-jet EEC data, validate background subtraction, and show path-length and diffusion-wake effects.

  3. Quantum Scaling in Energy Correlators Beyond the Confinement Transition

    hep-ph 2025-07 conditional novelty 6.0 of 10

    In the post-confinement regime the small-angle energy-energy correlator scales with the collision energy through the J=5 DGLAP anomalous dimension, and the light-ray OPE coefficients are moments of the dihadron fragme...

  4. Overview of recent results from the STAR experiment

    nucl-ex 2025-07 unverdicted novelty 1.0 of 10

    A proceedings overview reporting STAR's recent preliminary measurements of hard and electromagnetic probes in heavy-ion collisions at RHIC.

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