Limit on a P - and T -Violating Electron-Nucleon Interaction

Experiment searching for atomic electric-dipole moments (EDM) can set limits on various P - and T -violating properties. In this work we describe calculations of sensitivities of caesium and thallium to a possible P - and T -violating scalar-pseudoscalar electron-nucleon interaction. Combination of our Tl result with the most recent experimental limit for the Tl EDM gives C S = (2 ± 7) · 10 -7 , which is the lowest limit so far obtained for this interaction constant.