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Updated: Jul 12, 2026
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Precise QCD Predictions for Hadron-in-Jet Production in e^{+}e^{-} Collisions
Leonardo Bonino1, Aude Gehrmann-De Ridder1,2, Thomas Gehrmann1
1Universität Zürich, Physik-Institut, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Physical Review Letters
|July 10, 2026
Summary
This study computes hadron-in-jets production cross sections in electron-positron annihilation to next-to-next-to-leading order. Comparing with experimental data validates these precise theoretical predictions for fragmentation function studies.
Area of Science:
- High-energy particle physics
- Quantum Chromodynamics (QCD)
Background:
- Electron-positron annihilation provides a clean environment for studying fundamental particle interactions.
- Understanding parton fragmentation into hadrons is crucial for interpreting experimental results.
Purpose of the Study:
- To compute hadron-in-jets production cross sections to next-to-next-to-leading order (NNLO) in perturbative QCD.
- To provide precise theoretical predictions for e^{+}e^{-}→2 jets and e^{+}e^{-}→3 jets processes.
Main Methods:
- Perturbative Quantum Chromodynamics (pQCD) calculations.
- Next-to-next-to-leading order (NNLO) precision.
- Comparison with experimental data from the ALEPH experiment.
Main Results:
- Newly computed NNLO cross sections for hadron-in-jets production.
- Demonstration of the impact of these predictions on precision phenomenology.
- Validation against ALEPH experimental measurements.
Conclusions:
- The NNLO calculations offer improved theoretical precision for fragmentation function studies.
- The results have significant implications for precision measurements in particle physics.
- The study highlights the power of combining theoretical calculations with experimental data.
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