Transverse spin asymmetries at the EIC as a probe of anomalous electric and magnetic dipole moments

Radja Boughezal, Daniel De Florian, Frank Petriello, Werner Vogelsang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We show that inclusive single-spin asymmetries (SSAs) with transversely polarized protons or electrons at a future electron ion collider (EIC) are sensitive to new physics contributions to electroweak dipole operators of electrons and quarks. We use the Standard Model Effective Field Theory (SMEFT) to parametrize possible heavy new physics contributions to these couplings. We show that new physics scales at or beyond the TeV-scale can be probed assuming realistic EIC run parameters, and that the transverse spin asymmetries are sensitive to different combinations of the dipole couplings than other measurements such as anomalous magnetic or electric dipole moments. We also study the physics potential of SSAs at a possible future upgrade of the EIC to collide muons and protons. Measurements at such an upgrade could probe the same SMEFT parameters that explain the current anomaly in the muon anomalous magnetic moment, and could also improve current bounds on the muon electric dipole moment.

Original languageEnglish (US)
Article number075028
JournalPhysical Review D
Issue number7
StatePublished - Apr 1 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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