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Transverse spin effects and light-quark dipole moments at lepton colliders

Xin-Kai Wen1,2,3, Bin Yan2,*, Zhite Yu4,†, and C.-P. Yuan5

  • *Contact author: yanbin@ihep.ac.cn
  • †Contact author: yuzhite@jlab.org
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Phys. Rev. D 112, 053004 – Published 15 September, 2025

DOI: https://doi.org/10.1103/32nb-d466

Abstract

We propose to probe light-quark dipole interactions at lepton colliders using the azimuthal asymmetry of a collinear dihadron pair (h1h2) produced in association with another hadron h′. This asymmetry, arising from quantum interference in the quark spin space, is exclusively sensitive to dipole interactions at the leading power of the new physics scale and simultaneously probes both the real and imaginary components of the dipole couplings. By combining all possible channels of h′, this method allows for disentangling the up and down quark dipole moments and has the potential to significantly strengthen current constraints by one to two orders of magnitude.

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Phys. Rev. D 112, 053004– Published 15 September, 2025
  • Received 30 November 2024
  • Accepted 15 August 2025
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