First Extraction of Transverse-Momentum Dependent Helicity Distributions
We report on the first global analysis of transverse-momentum dependent helicity distributions of the proton. The analysis is performed at next-to-leading order with the evolution factor at next-to-next-to-leading-logarithmic accuracy. Nonzero signals are determined for up and down quarks, and their k_{T}-integrated polarization is consistent with analyses in collinear factorization, while the distributions of other flavors are loosely constrained by existing data. With increasing transverse momentum, quarks at large x become less polarized while those at small x become more polarized.
Authors
- Bo-Qiang Ma (ORCID: https://orcid.org/0000-0002-5660-1070)
- Y. X. Zhao (ORCID: https://orcid.org/0000-0001-8684-9766)
- Tianbo Liu (ORCID: https://orcid.org/0000-0002-4276-0599)
- Peng Sun (ORCID: https://orcid.org/0000-0002-0040-8597)
- Ke Yang (ORCID: https://orcid.org/0009-0002-6179-9875)
Institutions
- Shandong University (CN)
- Chinese Academy of Sciences (CN)
- Peking University (CN)
- Zhengzhou University (CN)
- Central China Normal University (CN)
- Institute of Modern Physics (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-25
- DOI
- https://doi.org/10.1103/physrevlett.134.121902
- Citations
- 7
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 13.09
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Shandong Province
- Basic and Applied Basic Research Foundation of Guangdong Province