Removing flat directions in SMEFT fits: how polarized electron-ion collider data can complement the LHC

Understand

We study the potential of future Electron-Ion Collider (EIC) data to probe four-fermion operators in the Standard Model Effective Field Theory (SMEFT).

• The ability to perform measurements with both polarized electron and proton beams at the EIC provides a powerful tool that can disentangle the effects from different SMEFT operators.
• We compare the potential constraints from an EIC with those obtained from Drell-Yan data at the Large Hadron Collider.
• We show that EIC data plays an important complementary role since it probes combinations of Wilson coefficients not accessible through available Drell-Yan measurements.