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Hunting the elusive X17 in CEνNS at the ESS

Cederkäll, J. LU ; Hiçyılmaz, Y. ; Lytken, E. LU orcid ; Moretti, S. and Rathsman, J. LU (2025) In Journal of High Energy Physics 2025(12).
Abstract

The so-called X17 particle has been proposed in order to explain a very significant resonant behaviour (in both the angular separation and invariant mass) of e+e− pairs produced during a nuclear transition of excited 8Be, 4He and 12C nuclei. Fits to the corresponding data point, as most probable explanation, to a spin-1 object, which is protophobic and has a mass of approximately 16.7 MeV, which then makes the X17 potentially observable in Coherent Elastic neutrino (ν) Nucleus Scattering (CEνNS) at the European Spallation Source (ESS). By adopting as theoretical framework a minimal extension of the Standard Model (SM) with a generic U(1)′ gauge group mixing with the hypercharge one... (More)

The so-called X17 particle has been proposed in order to explain a very significant resonant behaviour (in both the angular separation and invariant mass) of e+e− pairs produced during a nuclear transition of excited 8Be, 4He and 12C nuclei. Fits to the corresponding data point, as most probable explanation, to a spin-1 object, which is protophobic and has a mass of approximately 16.7 MeV, which then makes the X17 potentially observable in Coherent Elastic neutrino (ν) Nucleus Scattering (CEνNS) at the European Spallation Source (ESS). By adopting as theoretical framework a minimal extension of the Standard Model (SM) with a generic U(1)′ gauge group mixing with the hypercharge one of the latter, which can naturally accommodate the X17 state compliant with all available measurements from a variety of experiments, we predict that CEνNS at the ESS will constitute an effective means to probe this hypothesis, even after allowing for the inevitable systematics associated to the performance of the planned detectors therein.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
New Gauge Interactions, New Light Particles, Other Weak Scale BSM Models, Specific BSM Phenomenology
in
Journal of High Energy Physics
volume
2025
issue
12
article number
27
publisher
Springer
external identifiers
  • scopus:105024103708
ISSN
1029-8479
DOI
10.1007/JHEP12(2025)027
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Author(s) 2025.
id
70f142f3-a945-45bf-8bad-d1ef6db30380
date added to LUP
2026-02-13 13:19:14
date last changed
2026-02-13 13:20:29
@article{70f142f3-a945-45bf-8bad-d1ef6db30380,
  abstract     = {{<p>The so-called X17 particle has been proposed in order to explain a very significant resonant behaviour (in both the angular separation and invariant mass) of e<sup>+</sup>e<sup>−</sup> pairs produced during a nuclear transition of excited <sup>8</sup>Be, <sup>4</sup>He and <sup>12</sup>C nuclei. Fits to the corresponding data point, as most probable explanation, to a spin-1 object, which is protophobic and has a mass of approximately 16.7 MeV, which then makes the X17 potentially observable in Coherent Elastic neutrino (ν) Nucleus Scattering (CEνNS) at the European Spallation Source (ESS). By adopting as theoretical framework a minimal extension of the Standard Model (SM) with a generic U(1)′ gauge group mixing with the hypercharge one of the latter, which can naturally accommodate the X17 state compliant with all available measurements from a variety of experiments, we predict that CEνNS at the ESS will constitute an effective means to probe this hypothesis, even after allowing for the inevitable systematics associated to the performance of the planned detectors therein.</p>}},
  author       = {{Cederkäll, J. and Hiçyılmaz, Y. and Lytken, E. and Moretti, S. and Rathsman, J.}},
  issn         = {{1029-8479}},
  keywords     = {{New Gauge Interactions; New Light Particles; Other Weak Scale BSM Models; Specific BSM Phenomenology}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Hunting the elusive X17 in CEνNS at the ESS}},
  url          = {{http://dx.doi.org/10.1007/JHEP12(2025)027}},
  doi          = {{10.1007/JHEP12(2025)027}},
  volume       = {{2025}},
  year         = {{2025}},
}