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

Texas A&M University
Czech Technical University in Prague
AGH University of Krakow
Panjab University
Variable Energy Cyclotron Centre India
Kent State University
Brookhaven National Laboratory
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

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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.

Original language	English
Article number	261902
Journal	Physical Review Letters
Volume	135
Issue number	26
DOIs	https://doi.org/10.1103/jgsw-zhny
State	Published - Dec 31 2025

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@article{e6a0865f5a314fa48d34c4a82eb58889,

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 = "\{STAR Collaboration\} and Aboona, \{B. E.\} and J. Adam and L. Adamczyk and I. Aggarwal and Aggarwal, \{M. M.\} and Z. Ahammed and Alshammri, \{A. K.\} and Aschenauer, \{E. C.\} and S. Aslam and J. Atchison and V. Bairathi and X. Bao and P. Barik and K. Barish and S. Behera and R. Bellwied and P. Bhagat and A. Bhasin and S. Bhatta and Bhosale, \{S. R.\} and J. Bielcik and J. Bielcikova and Brandenburg, \{J. D.\} and C. Broodo and Cai, \{X. Z.\} and H. Caines and \{De La Barca S{\'a}nchez\}, \{M. Calder{\'o}n\} and D. Cebra and J. Ceska and I. Chakaberia and P. Chaloupka and Chang, \{Y. S.\} and Z. Chang and A. Chatterjee and D. Chen and Chen, \{J. H.\} and Q. Chen and W. Chen and Z. Chen and J. Cheng and Y. Cheng and W. Christie and X. Chu and S. Corey and Crawford, \{H. J.\} and M. Csan{\'a}d and G. Dale-Gau and A. Deshpande and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 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.",

year = "2025",

month = dec,

day = "31",

doi = "10.1103/jgsw-zhny",

language = "English",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "26",

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TY - JOUR

T1 - Energy Independence of the Collins Asymmetry in p ↑p Collisions

AU - STAR Collaboration

AU - Aboona, B. E.

AU - Adam, J.

AU - Adamczyk, L.

AU - Aggarwal, I.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Alshammri, A. K.

AU - Aschenauer, E. C.

AU - Aslam, S.

AU - Atchison, J.

AU - Bairathi, V.

AU - Bao, X.

AU - Barik, P.

AU - Barish, K.

AU - Behera, S.

AU - Bellwied, R.

AU - Bhagat, P.

AU - Bhasin, A.

AU - Bhatta, S.

AU - Bhosale, S. R.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Brandenburg, J. D.

AU - Broodo, C.

AU - Cai, X. Z.

AU - Caines, H.

AU - De La Barca Sánchez, M. Calderón

AU - Cebra, D.

AU - Ceska, J.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chang, Y. S.

AU - Chang, Z.

AU - Chatterjee, A.

AU - Chen, D.

AU - Chen, J. H.

AU - Chen, Q.

AU - Chen, W.

AU - Chen, Z.

AU - Cheng, J.

AU - Cheng, Y.

AU - Christie, W.

AU - Chu, X.

AU - Corey, S.

AU - Crawford, H. J.

AU - Csanád, M.

AU - Dale-Gau, G.

AU - Deshpande, A.

AU - Jia, J.

AU - Lacey, R.

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.

UR - https://www.scopus.com/pages/publications/105026237573

U2 - 10.1103/jgsw-zhny

DO - 10.1103/jgsw-zhny

M3 - Article

C2 - 41557397

AN - SCOPUS:105026237573

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26

M1 - 261902

ER -

Energy Independence of the Collins Asymmetry in p ↑p Collisions

Abstract

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