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A universal probe of QCD spin physics from fragmentation energy correlator
Abstract
We study the fragmentation energy correlator (FEC), which combines the nonperturbative fragmentation function with the infrared-safe energy correlator, as a new probe of the three-dimensional dynamics of QCD hadronization. We demonstrate, both theoretically and numerically, that FEC applies universally to inclusive hadron production in lepton-lepton, lepton-hadron, and hadron-hadron collisions, without requiring jet algorithms or simultaneous measurements of other heavy objects. Through the nontrivial transverse-spin dependence, FEC provides a sensitive probe of the chiral-symmetry-breaking scale in QCD via its variation with the energy-correlator scale.
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BibTeX
@misc{cao2026universal,
title = {{A universal probe of QCD spin physics from fragmentation energy correlator}},
author = {Qing-Hong Cao and Xiaohui Liu and Zhite Yu and C. -P. Yuan and Feng Yuan and Shu-Tao Zhang and Hua Xing Zhu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.32715},
eprint = {2610.32715},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.32715},
}
RIS
TY - UNPB
TI - A universal probe of QCD spin physics from fragmentation energy correlator
AU - Qing-Hong Cao
AU - Xiaohui Liu
AU - Zhite Yu
AU - C. -P. Yuan
AU - Feng Yuan
AU - Shu-Tao Zhang
AU - Hua Xing Zhu
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.32715
UR - https://arxiv.org/abs/2610.32715
AB - We study the fragmentation energy correlator (FEC), which combines the nonperturbative fragmentation function with the infrared-safe energy correlator, as a new probe of the three-dimensional dynamics of QCD hadronization. We demonstrate, both theoretically and numerically, that FEC applies universally to inclusive hadron production in lepton-lepton, lepton-hadron, and hadron-hadron collisions, without requiring jet algorithms or simultaneous measurements of other heavy objects. Through the nontrivial transverse-spin dependence, FEC provides a sensitive probe of the chiral-symmetry-breaking scale in QCD via its variation with the energy-correlator scale.
ER -