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Dihadron Fragmentation Framework for Near-Side Energy-Energy Correlators.

Zhong-Bo Kang1,2,3, Andreas Metz4, Daniel Pitonyak5

  • 1University of California, Los Angeles, Department of Physics and Astronomy, California 90095, USA.

Physical Review Letters
|March 13, 2026
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Summary
This summary is machine-generated.

Researchers developed a new method to analyze particle interactions using dihadron fragmentation functions. This approach connects nonperturbative and perturbative regions, enabling simultaneous analysis of energy-energy correlators (EECs).

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Energy-Energy Correlators (EECs) are crucial for understanding particle interactions in high-energy physics.
  • Analyzing both nonperturbative and perturbative regions of EECs remains a challenge.

Purpose of the Study:

  • To develop a unified theoretical framework for analyzing near-side EECs across different kinematic regions.
  • To introduce and validate a new nonperturbative function, the "EEC DiFF", for this analysis.

Main Methods:

  • Established an analytical approach based on dihadron fragmentation functions (DiFFs).
  • Introduced the "EEC DiFF" function and demonstrated its connection to perturbative "EEC jet" functions.
  • Derived a new result for near-side EECs in the free hadron and transition regions.
  • Performed the first fit of the EEC DiFF model to experimental data.

Main Results:

  • Successfully connected the nonperturbative (free hadron/transition) regions with the perturbative (quark-gluon) region.
  • The "EEC DiFF" function bridges these regions, allowing simultaneous analysis.
  • The model showed reasonable agreement with experimental data for near-side EECs.

Conclusions:

  • The new framework provides a unified method for studying EECs.
  • This approach advances the understanding of particle interactions in e+e- annihilation.
  • The "EEC DiFF" offers a promising tool for future theoretical and experimental analyses.