Enhanced $\mathcal{P,T}$-violating nuclear magnetic quadrupole moment effects in laser-coolable molecules

TL;DR

This paper presents precise calculations of nuclear magnetic quadrupole moments in certain molecules, which are crucial for probing new physics beyond the Standard Model through experiments detecting symmetry violations.

Contribution

The study provides the first accurate relativistic coupled cluster calculations of nuclear MQM interaction constants in specific laser-coolable molecules, with uncertainty estimates.

Findings

Calculated interaction constants for BaF, YbF, BaOH, and YbOH.

Discussed implications for experiments searching for nuclear MQMs.

Provided uncertainty estimates for the calculations.

Abstract

Nuclear magnetic quadrupole moments (MQMs), like intrinsic electric dipole moments of elementary particles, violate both parity and time-reversal symmetry and therefore probe physics beyond the Standard Model of particle physics. We report on accurate relativistic coupled cluster calculations of the nuclear MQM interaction constants in BaF, YbF, BaOH, and YbOH. We elaborate on estimates of the uncertainty of our results. The implications of experiments searching for nonzero nuclear MQMs are discussed.