Manifestations of nuclear CP-violation in ThO molecule

TL;DR

This paper explores how CP violation manifests in the ThO molecule, linking nuclear effects to fundamental T and P violating interactions, and discusses recent experimental improvements in measuring electron EDM.

Contribution

It provides theoretical calculations connecting nuclear and molecular effects of CP violation in ThO to fundamental T, P-odd nuclear forces and particle physics parameters.

Findings

Improved limit on electron EDM by an order of magnitude

Expressed T,P-violating effects in ThO in terms of fundamental constants

Performed nuclear and molecular calculations to relate observable effects to particle physics parameters

Abstract

Investigations of CP violation in hadron sector may be done using measurements in the ThO molecule. Recent measurements in this molecule improved the limit on electron EDM by an order of magnitude. Another time reversal (T) and parity (P) violating effect in $^{229}$ThO is induced by the nuclear magnetic quadrupole moment. We have performed nuclear and molecular calculations to express this effect in terms of the strength constants of T,P-odd nuclear forces, neutron EDM, QCD vacuum angle $\theta$, quark EDM and chromo-EDM.