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

Abstract

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 parameterize 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.

12 pages, 8 figures

References in corpus (11)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Measurement of the fine-structure constant as a test of the Standard Model
• Evidence for polarization of gluons in the proton
• Effective field theory interpretation of lepton magnetic and electric dipole moments
• Charged Lepton Flavor Violation at the EIC
• Transverse target spin asymmetry in inclusive DIS with two-photon exchange
• A partonic description of the transverse target single-spin asymmetry in inclusive DIS
• Neutral-Current Electroweak Physics and SMEFT Studies at the EIC
• Transverse single spin asymmetries in inclusive deep-inelastic scattering
• Electron-Ion Collider impact study on the tensor charge of the nucleon
• Two-Photon Exchange in (Semi-)Inclusive DIS

Cited by in corpus (5)

• Testing Lepton Flavor Universality at the Electron-Ion Collider
• Nucleon Energy Correlators as a Probe of Light-Quark Dipole Operators at the Electron-Ion Collider
• Perturbative QCD Prediction of the Hyperon EDM from CP-violating Dipole Interactions
• Probing top-quark electroweak couplings indirectly at the Electron-Ion Collider
• Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders