All papers · LCP000055

Constraints on New Vector Boson Mediated Electron-Nucleus Interactions from Spectroscopy Data of Polar Diatomic Molecules

Konstantin Gaul, Lei Cong, Dmitry Budker

Phys. Rev. Lett. 136, 181805 (2026) · DOI: 10.1103/d19m-s856

License: CC BY 4.0.

Abstract

A measurement of parity violation in the hyperfine structure of $^{138}$Ba$^{19}$F [E. Altuntaş et al. Phys. Rev. Lett. 120, 142501 (2018)] is reinterpreted with electronic structure calculations in terms of beyond standard model vector boson mediated electron-nucleus interactions. Our results set constraints on previously unexplored, new boson mediated axial vector-vector nucleus-electron interactions. Similar bounds are obtained by analyzing the atomic parity violation experiment with $^{133}$Cs. Moreover, we show that future experiments with cold heavy diatomic molecules like $^{137}$BaF or $^{225}$RaF can improve the present sensitivity to axial vector-vector nucleus-electron and nucleon-nucleus interactions by at least 2 orders of magnitude for large boson masses.

Figures

3 panels with data across 1 figure. Each panel page shows the plot, its columns and its files; each data.csv begins with a header naming the paper, the panel, the source, the license and the provenance route.

Fig. 1

Illustrative figure, no extractable data. Shown in the paper PDF.

Fig. 2

• panel (a): AV-Ne coupling bound $|g^{\mathrm{A}}_{\mathrm{N}}\,g^{\mathrm{V}}_{\mathrm{e}}|$ against boson mass $Mc^2$/eV, log-log. Solid: constraints from Cs, this work and Ba$^{19}$F; dotted: projected sensitivities of $^{137}$BaF, $^{225}$RaF, Ra$^{19}$F, $^{29}$SiO$^{+}$, Si$^{17}$O$^{+}$; light grey: Combined. Excluded regions, filled in print, are drawn as their boundary lines. data.csv
• panel (b): AV-(n,p)N coupling bound $|g^{\mathrm{A}}_{\mathrm{n,p}}\,g^{\mathrm{V}}_{\mathrm{N}}|$ against boson mass $Mc^2$/eV, log-log. Solid: constraints from Ba$^{19}$F and Cs, Dzuba2017; dotted: projected sensitivities of $^{137}$BaF, $^{225}$RaF, Ra$^{19}$F, $^{29}$SiO$^{+}$, Si$^{17}$O$^{+}$; light grey: Combined. Excluded regions, filled in print, are drawn as their boundary lines. data.csv
• panel (c): AV-eN coupling bound $|g^{\mathrm{A}}_{\mathrm{e}}\,g^{\mathrm{V}}_{\mathrm{N}}|$ against boson mass $Mc^2$/eV, log-log. Solid: constraints from Ba$^{19}$F and Cs, Dzuba2017; dotted: projected sensitivities of $^{137}$BaF, $^{225}$RaF, Ra$^{19}$F, $^{29}$SiO$^{+}$, Si$^{17}$O$^{+}$; light grey: Combined. Excluded regions, filled in print, are drawn as their boundary lines. data.csv

Cite

Konstantin Gaul, Lei Cong, Dmitry Budker. Constraints on New Vector Boson Mediated Electron-Nucleus Interactions from Spectroscopy Data of Polar Diatomic Molecules. Phys. Rev. Lett. 136, 181805 (2026). https://doi.org/10.1103/d19m-s856

When you use hosted data, cite the original paper and give the panel's URL so a reader can find the exact values you used.