TY - JOUR
T1 - Energy Independence of the Collins Asymmetry in p ↑p Collisions
AU - Aboona, B. E.
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.
UR - https://www.scopus.com/pages/publications/105026237573
U2 - 10.1103/jgsw-zhny
DO - 10.1103/jgsw-zhny
M3 - Article
AN - SCOPUS:105026237573
SN - 0031-9007
VL - 135
JO - Physical Review Letters
JF - Physical Review Letters
IS - 26
M1 - 261902
ER -