Fig. 5
Experimental constraint on the interaction V. The red curve indicates the experimental limit of our experiment on the electron-nucleon coupling \(g_{\mathrm{A}}^{\mathrm{e}}g_{\mathrm{V}}^{\mathrm{N}}\) with 1 σ uncertainty as a function of the interaction range λ in the bottom axis and the boson mass mb in the top axis. Our experiment is sensitive for mb < 10−3 eV and λ > 10−4 m. The gray line indicates the same coupling which can be also derived from atomic parity non-conservation (PNC) experiments26. Our experiment significantly enhances the constraint for \(g_{\mathrm{A}}^{\mathrm{e}}g_{\mathrm{V}}^{\mathrm{N}}\) by 17 orders of magnitude beyond the PNC experiments. The blue line indicates the constraint from the electron-spin polarized torsion pendulum34
