Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation

[2504.11439] Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search High Energy Physics - Phenomenology arXiv:2504.11439 (hep-ph) [Submitted on 15 Apr 2025 ( v1 ), last revised 14 Apr 2026 (this version, v2)] Title: Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation Authors: Fernando Arias-Aragón , Giovanni Grilli di Cortona , Enrico Nardi , Claudio Toni View a PDF of the paper titled Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation, by Fernando Arias-Arag\'on and 3 other authors View PDF HTML (experimental) Abstract: 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 $(1.77\pm 0.15)\,\sigma$ 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. Comments: 12 pages, 2 figures, 1 table. Matched to the published version Subjects: High Energy Physics - Phenomenology (hep-ph) ; High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th) Cite as: arXiv:2504.11439 [hep-ph] (or arXiv:2504.11439v2 [hep-ph] for this version) https://doi.org/10.48550/arXiv.2504.11439 Focus to learn more arXiv-issued DOI via DataCite Related DOI : https://doi.org/10.1140/epjc/s10052-026-15587-2 Focus to learn more DOI(s) linking to related resources Submission history From: Claudio Toni [ view email ] [v1] Tue, 15 Apr 2025 17:53:40 UTC (345 KB) [v2] Tue, 14 Apr 2026 11:24:42 UTC (385 KB) Full-text links: Access Paper: View a PDF of the paper titled Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation, by Fernando Arias-Arag\'on and 3 other authors View PDF HTML (experimental) TeX Source view license Current browse context: hep-ph < prev | next > new | recent | 2025-04 Change to browse by: hep-ex nucl-ex nucl-th References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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