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We show that only 10 (17) CP-odd operators of the SMEFT give the leading,i.e. least suppressed by the new physics scale, CP-violating contributions oncewe assume that all fermions are massless but the top (and bottom) quark(s). Westart with a short review of previous analyses focusing on operators of ourreduced basis and list different observables probing their CP violating effectsby direct measurements at colliders and by indirect measurements in low-energyobservables. Since CP-odd operators typically lead to phase space suppressedinterferences, we quantify the efficiency to revive the interference forvarious observables found in the literature but also for new observables indiboson production. Our new observables are found to be more efficient on thewhole experimental fiducial phase space and are complementary to thosepresented so far as they probe different combinations of operators and gettheir sensitivities from different regions of the phase space.

A Reduced basis for CP violation in SMEFT at colliders and its application to Diboson production