Energy Independence of the Collins Asymmetry in p ↑p Collisions

STAR Collaboration

doi:10.1103/jgsw-zhny

Energy Independence of the Collins Asymmetry in p ↑p Collisions

STAR Collaboration

Instituto de Alta Investigación

Texas A&M University
Czech Technical University in Prague
AGH University of Krakow
Panjab University
Brookhaven National Laboratory
Variable Energy Cyclotron Centre
Kent State University
Fudan University
Abilene Christian University
Universidad de Tarapacá
Shandong University
Indian Institute of Science Education and Research, Berhampur
University of California at Riverside
Indian Institute of Science Education and Research, Tirupati
University of Houston
University of Jammu
Stony Brook University
Czech Academy of Sciences
Ohio State University
Chinese Academy of Sciences
Yale University
University of California at Davis
Lawrence Berkeley National Laboratory
Purdue University
Indiana University Bloomington
National Institute of Technology, Durgapur
Guangxi Normal University
Tsinghua University
University of California at Los Angeles
University of California at Berkeley
Eötvös Loránd University
Heidelberg University
American University in Cairo
Rice University
University of Tsukuba
University of Illinois at Chicago
Central China Normal University
University of Kentucky
University of Calabria
Southern Connecticut State University
CAS - Institute of Modern Physics
Technische Universität Darmstadt
Valparaiso University
Huzhou University
University of Chinese Academy of Sciences
Academia Sinica Taiwan HQ
National Cheng Kung University
University of Science and Technology of China
Sejong University
Wayne State University
Warsaw University of Technology
Goethe University Frankfurt
Lehigh University
Wuhan University of Science and Technology
South China Normal University
Texas Southern University
University of Texas at Austin
National Institute of Science Education and Research
Lovely Professional University
Temple University
Rutgers - The State University of New Jersey, New Brunswick
Max Planck Institute for Physics (Werner Heisenberg Institute)
Creighton University
Indian Institute of Technology Patna
Ball State University
Michigan State University
Argonne National Laboratory
United States Naval Academy
Chongqing University
Lanzhou University

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Resumen

The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for π± within jets, namely the Collins asymmetries, from transversely polarized p↑p collisions at s=510 GeV. The energy-scaled distribution of jet transverse momentum, xT=2pT,jet/s, shows a remarkable consistency for Collins asymmetries of π± in jets between s=200 GeV and 510 GeV. This indicates that the Collins asymmetries are nearly energy independent, with, at most, a very weak scale dependence in p↑p collisions. These results extend to high-momentum scales (Q2≤3400 GeV2) and enable unique tests of evolution and universality in the transverse-momentum-dependent formalism, thus providing important constraints for the Collins fragmentation functions.

Idioma original	Inglés
Número de artículo	261902
Publicación	Physical Review Letters
Volumen	135
N.º	26
DOI	https://doi.org/10.1103/jgsw-zhny
Estado	Publicada - 31 dic 2025

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title = "Energy Independence of the Collins Asymmetry in p ↑p Collisions",

abstract = "The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for π± within jets, namely the Collins asymmetries, from transversely polarized p↑p collisions at s=510 GeV. The energy-scaled distribution of jet transverse momentum, xT=2pT,jet/s, shows a remarkable consistency for Collins asymmetries of π± in jets between s=200 GeV and 510 GeV. This indicates that the Collins asymmetries are nearly energy independent, with, at most, a very weak scale dependence in p↑p collisions. These results extend to high-momentum scales (Q2≤3400 GeV2) and enable unique tests of evolution and universality in the transverse-momentum-dependent formalism, thus providing important constraints for the Collins fragmentation functions.",

author = "Aboona, \{B. E.\} and J. Adam and L. Adamczyk and I. Aggarwal and S. Kabana and \{STAR Collaboration\}",

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AU - Adam, J.

AU - Adamczyk, L.

AU - Aggarwal, I.

AU - Kabana, S.

AU - STAR Collaboration

N1 - Publisher Copyright: © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

PY - 2025/12/31

Y1 - 2025/12/31

N2 - The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for π± within jets, namely the Collins asymmetries, from transversely polarized p↑p collisions at s=510 GeV. The energy-scaled distribution of jet transverse momentum, xT=2pT,jet/s, shows a remarkable consistency for Collins asymmetries of π± in jets between s=200 GeV and 510 GeV. This indicates that the Collins asymmetries are nearly energy independent, with, at most, a very weak scale dependence in p↑p collisions. These results extend to high-momentum scales (Q2≤3400 GeV2) and enable unique tests of evolution and universality in the transverse-momentum-dependent formalism, thus providing important constraints for the Collins fragmentation functions.

AB - The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for π± within jets, namely the Collins asymmetries, from transversely polarized p↑p collisions at s=510 GeV. The energy-scaled distribution of jet transverse momentum, xT=2pT,jet/s, shows a remarkable consistency for Collins asymmetries of π± in jets between s=200 GeV and 510 GeV. This indicates that the Collins asymmetries are nearly energy independent, with, at most, a very weak scale dependence in p↑p collisions. These results extend to high-momentum scales (Q2≤3400 GeV2) and enable unique tests of evolution and universality in the transverse-momentum-dependent formalism, thus providing important constraints for the Collins fragmentation functions.

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ER -

Energy Independence of the Collins Asymmetry in p ↑p Collisions

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