Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation
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| Format: | Preprint |
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2025
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| _version_ | 1866918444358696960 |
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| author | Arias-Aragón, Fernando di Cortona, Giovanni Grilli Nardi, Enrico Toni, Claudio |
| author_facet | Arias-Aragón, Fernando di Cortona, Giovanni Grilli Nardi, Enrico Toni, Claudio |
| contents | The Positron Annihilation into Dark Matter Experiment at the Laboratori Nazionali di Frascati has reported an excess of $e^+e^-$ final-state events from positron annihilation on fixed-target atomic electrons. While the global significance remains at the $(1.77\pm 0.15)\,σ$ level, the excess is centered around $\sqrt{s} \sim 17\,\text{MeV}$, coinciding with the invariant mass at which anomalous $e^+e^-$ pair production has previously been observed in nuclear transitions from excited to ground states in $^8$Be, $^4$He and $^{12}$C, thereby strengthening the case for a common underlying origin, possibly involving a hypothetical new $X_{17}$ boson. We discuss the significance of this independent accelerator-based evidence. Combining it with existing nuclear physics results, we obtain a value for the $X_{17}$ mass of $m_{X_{17}} = 16.88 \pm 0.05\,\text{MeV}$, reducing the uncertainty from nuclear physics determinations by more than a factor of two, and mitigating the impact of poorly known correlations among their systematic errors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_11439 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation Arias-Aragón, Fernando di Cortona, Giovanni Grilli Nardi, Enrico Toni, Claudio High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory The Positron Annihilation into Dark Matter Experiment at the Laboratori Nazionali di Frascati has reported an excess of $e^+e^-$ final-state events from positron annihilation on fixed-target atomic electrons. While the global significance remains at the $(1.77\pm 0.15)\,σ$ level, the excess is centered around $\sqrt{s} \sim 17\,\text{MeV}$, coinciding with the invariant mass at which anomalous $e^+e^-$ pair production has previously been observed in nuclear transitions from excited to ground states in $^8$Be, $^4$He and $^{12}$C, thereby strengthening the case for a common underlying origin, possibly involving a hypothetical new $X_{17}$ boson. We discuss the significance of this independent accelerator-based evidence. Combining it with existing nuclear physics results, we obtain a value for the $X_{17}$ mass of $m_{X_{17}} = 16.88 \pm 0.05\,\text{MeV}$, reducing the uncertainty from nuclear physics determinations by more than a factor of two, and mitigating the impact of poorly known correlations among their systematic errors. |
| title | Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2504.11439 |