Compatibility of the Updated $(g-2)_μ$, $(g-2)_e$ and PADME-Favored Couplings with the Preferred Region of ATOMKI X17
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866915766146695168 |
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| author | Peets, Emrys |
| author_facet | Peets, Emrys |
| contents | We re-evaluate the viability of a kinetically mixed dark photon ($A^{\prime}$) as a solution to the muon anomalous magnetic moment $(g-2)μ$ discrepancy and the ATOMKI nuclear anomalies near 17~MeV, using the final FNAL measurement and the latest theory predictions (BMW21, WP25). For $m_{A^{\prime}} = 17$~MeV, the allowed kinetic mixing parameter narrows to $\varepsilon_μ= 7.03(58)\times10^{-4}$ (WP25). We then directly compare the allowed region for the muon and X17 bands to those preferred by the electron magnetic moment measurements. For the electron, we obtain $\varepsilon_e = 1.19(15)\times10^{-3}$ (Cs, 2018) and $\varepsilon_e = 0.69(15)\times10^{-3}$ (Rb, 2020), based on two recent measurements of the fine structure constant compared to the most recent experimental value determined using a one-electron quantum cyclotron. This study focuses on the protophobic vector interpretation of X17 and assumes $\varepsilon_ν<<\varepsilon_l$. While a mild tension persists, we identify a narrow overlapping region, $6.8\times10^{-4} \lesssim \varepsilon \lesssim 9.6\times10^{-4}$, between recent PADME results, the NA64 exclusion, and within the 2$σ$ preferred coupling region given by the Rb 2020 determination of $α_\varepsilon$. These results provide well-defined targets for future experimental searches and motivate further theoretical refinements, both of which will play a decisive role in assessing the validity of the ATOMKI anomaly claims. Of particular note is the fixed target X17 experiment to be conducted in Hall-B of Thomas Jefferson National Accelerator Facility in Summer of 2026. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_05288 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Compatibility of the Updated $(g-2)_μ$, $(g-2)_e$ and PADME-Favored Couplings with the Preferred Region of ATOMKI X17 Peets, Emrys High Energy Physics - Phenomenology High Energy Physics - Experiment We re-evaluate the viability of a kinetically mixed dark photon ($A^{\prime}$) as a solution to the muon anomalous magnetic moment $(g-2)μ$ discrepancy and the ATOMKI nuclear anomalies near 17~MeV, using the final FNAL measurement and the latest theory predictions (BMW21, WP25). For $m_{A^{\prime}} = 17$~MeV, the allowed kinetic mixing parameter narrows to $\varepsilon_μ= 7.03(58)\times10^{-4}$ (WP25). We then directly compare the allowed region for the muon and X17 bands to those preferred by the electron magnetic moment measurements. For the electron, we obtain $\varepsilon_e = 1.19(15)\times10^{-3}$ (Cs, 2018) and $\varepsilon_e = 0.69(15)\times10^{-3}$ (Rb, 2020), based on two recent measurements of the fine structure constant compared to the most recent experimental value determined using a one-electron quantum cyclotron. This study focuses on the protophobic vector interpretation of X17 and assumes $\varepsilon_ν<<\varepsilon_l$. While a mild tension persists, we identify a narrow overlapping region, $6.8\times10^{-4} \lesssim \varepsilon \lesssim 9.6\times10^{-4}$, between recent PADME results, the NA64 exclusion, and within the 2$σ$ preferred coupling region given by the Rb 2020 determination of $α_\varepsilon$. These results provide well-defined targets for future experimental searches and motivate further theoretical refinements, both of which will play a decisive role in assessing the validity of the ATOMKI anomaly claims. Of particular note is the fixed target X17 experiment to be conducted in Hall-B of Thomas Jefferson National Accelerator Facility in Summer of 2026. |
| title | Compatibility of the Updated $(g-2)_μ$, $(g-2)_e$ and PADME-Favored Couplings with the Preferred Region of ATOMKI X17 |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.05288 |