TaO${}^{+}$, a Candidate Molecular Ion in Search of Physics Beyond the Standard Model

Abstract

The TaO${}^{+}$ molecular ion is proposed as a candidate system for detecting signatures of charge parity ($\mathcal{C}\mathcal{P}$) violating physics beyond the standard model of elementary particles. The electron electric dipole moment (EDM) effective electric field $E_{\text{eff}}=20.2\left[\frac{\mathrm{GV}}{\mathrm{cm}}\right]$, the nucleon-electron scalar-pseudoscalar (ne-SPS) interaction constant $W_S=17.7$ [kHz] and the nuclear magnetic quadrupole interaction constant $W_M=0.45$ [$\frac{10^{33}\text{Hz}}{e{\text{cm}}^2}$] are found to be sizeable $\mathcal{P},\mathcal{T}$-odd enhancements. The ratio of the leptonic and semi-leptonic enhancements differs strongly from the one for the ThO system which may provide improved limits on the electron EDM, $d_e$, and the SPS coupling constant, $C_S$. TaO${}^{+}$ is found to have a ${}^3{\Delta }_1$ electronic ground state like the previously proposed ThF${}^{+}$ molecular ion, but an order of magnitude smaller parallel G-tensor component which makes it less vulnerable to systematic errors in experiment.

9 pages, 1 figure

References in corpus (5)

• Electric Dipole Moments: A Global Analysis
• Time-reversal symmetry violation in molecules induced by nuclear magnetic quadrupole moments
• Theoretical study of thorium monoxide for the electron electric dipole moment search, II: Electronic properties of $H^3{\Delta }_1$ in ThO
• Broadband velocity modulation spectroscopy of HfF^+: towards a measurement of the electron electric dipole moment
• Manifestations of nuclear CP-violation in ThO molecule

Cited by in corpus (4)

• $\mathcal{P},\mathcal{T}$-Odd and Magnetic Hyperfine Interaction Constants and Excited-State Lifetime for HfF${}^{+}$
• Calculations of Time-Reversal Symmetry Violation Sensitivity Parameters Based on Analytic Relativistic Coupled-Cluster Gradient Theory
• Effect of the neutron quadrupole distribution in the TaO${}^{+}$ cation
• Spectroscopic and Electric Properties of the TaO${}^{+}$ Molecule Ion for the Search of New Physics: A Platform for Identification and State Control