Effects of dispersion parity-violating interaction in electron scattering and atoms
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arXiv
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| Natura: | Preprint |
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2026
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| author | Flambaum, V. V. Samsonov, I. B. |
| author_facet | Flambaum, V. V. Samsonov, I. B. |
| contents | Exchange of two neutrinos (as well as other fermions) generates a long-range parity-violating (PV) potential of the form $\sim G^2/r^5$, with characteristic range $\hbar/(2m_νc)$. In atomic systems the corresponding matrix elements converge at distances $r < 10/M_Z$, so that the interaction between electron and quarks effectively reduces to a contact term $\sim G^2 M_Z^2 δ^{3}(\vec{r}) \sim G\,α\,δ^{3}(\vec{r})$. This interaction produces a $-0.8\%$ correction to the effective weak charge of cesium, resolving the $2σ$ discrepancy between the Standard Model prediction and the measured Cs parity-violation amplitude. The corresponding value of the weak mixing angle is $\sin^2θ_W = 0.2375(19)$ at $q^2 \approx 0$, in agreement with the Standard Model prediction $\sin^2θ_W = 0.23873$. The relative correction to the proton weak charge is about $3\%$, with a similar correction for the electron weak charge. Using these results, we revisit the limits on an additional $Z'$ boson and obtain a constraint on isospin-conserving oblique radiative corrections characterized by the Peskin--Takeuchi parameter $S = -0.32(53)$, at $q^2 \approx 0$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_22466 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Effects of dispersion parity-violating interaction in electron scattering and atoms Flambaum, V. V. Samsonov, I. B. High Energy Physics - Phenomenology Atomic Physics Exchange of two neutrinos (as well as other fermions) generates a long-range parity-violating (PV) potential of the form $\sim G^2/r^5$, with characteristic range $\hbar/(2m_νc)$. In atomic systems the corresponding matrix elements converge at distances $r < 10/M_Z$, so that the interaction between electron and quarks effectively reduces to a contact term $\sim G^2 M_Z^2 δ^{3}(\vec{r}) \sim G\,α\,δ^{3}(\vec{r})$. This interaction produces a $-0.8\%$ correction to the effective weak charge of cesium, resolving the $2σ$ discrepancy between the Standard Model prediction and the measured Cs parity-violation amplitude. The corresponding value of the weak mixing angle is $\sin^2θ_W = 0.2375(19)$ at $q^2 \approx 0$, in agreement with the Standard Model prediction $\sin^2θ_W = 0.23873$. The relative correction to the proton weak charge is about $3\%$, with a similar correction for the electron weak charge. Using these results, we revisit the limits on an additional $Z'$ boson and obtain a constraint on isospin-conserving oblique radiative corrections characterized by the Peskin--Takeuchi parameter $S = -0.32(53)$, at $q^2 \approx 0$. |
| title | Effects of dispersion parity-violating interaction in electron scattering and atoms |
| topic | High Energy Physics - Phenomenology Atomic Physics |
| url | https://arxiv.org/abs/2602.22466 |