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  • Letter
  • Open Access

How to determine nucleon polarization at existing collider experiments?

Yu-Tie Liang1,2,*, Xiao-Rong Lv1,2, Andrzej Kupsc3,4,†, Boxing Gou1,2,‡, and Hai-Bo Li5,2,§

  • *Contact author: liangyt@impcas.ac.cn
  • †Contact author: andrzej.kupsc@physics.uu.se
  • ‡Contact author: gouboxing@impcas.ac.cn
  • §Contact author: lihb@ihep.ac.cn
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Phys. Rev. D 112, L031502 – Published 27 August, 2025

DOI: https://doi.org/10.1103/c642-1lzb

Abstract

We propose a novel approach to measure the spin polarization of protons produced in electron-positron collisions. Using existing tracking devices and supporting structure material, general-purpose spectrometers can be utilized as a large-acceptance polarimeter without a hardware upgrade. With the proposed approach, the spin polarization of protons can be revealed, providing a complementary and accurate description of the final-state particles. This could have far-reaching implications, such as enabling the complete determination of the nucleon timelike electromagnetic form factors.

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Phys. Rev. D 112, L031502– Published 27 August, 2025
  • Received 6 January 2025
  • Accepted 1 August 2025
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Published by the American Physical Society under the terms of the 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.

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