TaN molecule as a candidate to search for New physics

TL;DR

The paper demonstrates that the TaN molecule is an excellent candidate for detecting T,P-violating effects, providing detailed calculations of various T,P-odd interactions and nuclear properties relevant for new physics searches.

Contribution

It presents the first coupled-cluster calculations of T,P-odd effects in TaN, linking molecular observables to fundamental T,P-odd nuclear force parameters and particle EDMs.

Findings

TaN is highly suitable for T,P-violation experiments.

Calculated T,P-odd effects relate to nuclear force constants and particle EDMs.

Provides molecular and nuclear property data for experimental searches.

Abstract

It is demonstrated that the TaN molecule is the best candidate to search for T,P-violating nuclear magnetic quadrupole moment (MQM), it also looks promising to search for other T,P-odd effects. We report results of coupled-cluster calculations of T,P-odd effects in TaN produced by the Ta nucleus MQM, electron electric dipole moment (EDM), scalar$-$pseudoscalar nucleus$-$electron interactions, also of the molecule-axis hyperfine structure constant and dipole moment. Nuclear calculations of $^{181}$Ta MQM are performed to express the T,P-odd effect in terms of the strength constants of T,P-odd nuclear forces, proton and neutron EDM, QCD parameter $\theta$ and quark chromo-EDM.