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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
Summary
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).
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.
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