Semi-hadronic charge-parity violation interaction constants in CsAg, FrLi and FrAg molecules

Aurélien Marc; Timo Fleig

doi:10.1140/epjd/s10053-025-00967-2

2023 Impact factor 1.5

Atomic, Molecular, Optical and Plasma Physics

Open Access

Eur. Phys. J. D (2025) 79: 19
https://doi.org/10.1140/epjd/s10053-025-00967-2

Regular Article - : Atomic Physics

Semi-hadronic charge-parity violation interaction constants in CsAg, FrLi and FrAg molecules

Aurélien Marc and Timo Fleig^a

Laboratoire de Chimie et Physique Quantiques, FeRMI, Université Paul Sabatier Toulouse III, 118 Route de Narbonne, F-31062, Toulouse, France

^a timo.fleig@irsamc.ups-tlse.fr

Received: 11 November 2024
Accepted: 9 February 2025
Published online: 7 March 2025

Abstract

We present a systematic study of the nucleon-electron tensor-pseudotensor (Ne-TPT) interaction in the francium-silver (FrAg), cesium-silver (CsAg), and francium-lithium (FrLi) molecules which are candidates for next-generation experimental searches for new sources of charge-parity violation. The considered molecules are all amenable to assembly from laser-cooled atoms, with the FrAg molecule previously shown to be the most sensitive to the Schiff moment interaction in this set. Interelectron correlation effects are treated through relativistic general-excitation-rank configuration interaction theory in the framework of the Dirac–Coulomb Hamiltonian. We find in FrAg the Ne-TPT interaction constant to be $W_{T} (Fr) = 2.57 \pm 0.21 [{〈 Σ 〉}_{A} kHz]$ $W_T({\text {Fr}}) = 2.57 \pm 0.21 [\left<\Sigma \right>_A \textrm{kHz}]$ , considering the Francium atom as target of the measurement. Taking into account nuclear structure in a multi-source interpretation of a measured electric dipole moment, FrAg is found to be an excellent probe of physics beyond the standard model as this system will in addition to its sizeable Ne-TPT interaction constant greatly constrain fundamental parameters such as the semileptonic four-fermion interaction $C_{lequ}$ $C_{\text {lequ}}$ from which nuclear and atomic $CP$ $\mathcal{{CP}}$ -violating properties arise.

© The Author(s) 2025

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