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

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Abstract
We propose to probe light-quark dipole interactions at lepton colliders using the azimuthal asymmetry of a collinear dihadron pair ( h 1 h 2 ) 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.
Funding Information
  • National Natural Science Foundation of China (12235001, 12342502, 12422506)
  • Institute of High Energy Physics, Chinese Academy of Sciences (E25153U1)
  • Chinese Academy of Sciences (E429A6M1)
  • U.S. Department of Energy (DE-AC05-06OR23177)
  • Thomas Jefferson National Accelerator Facility
  • National Science Foundation (PHY-2310291)

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