Hunting the elusive X17 in CEνNS at the ESS
Hunting the elusive X17 in CEνNS at the ESS
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 12Cnuclei. Fits to the corresponding data point, as most probable explanation, to aspin-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.
hep-ph
Cederkäll, Joakim
dc613d0c-2af4-4188-8373-e6058cbea7dd
Hiçyılmaz, Yaşar
414f71c1-1f3f-4f2c-b579-d32277cb112c
Lytken, Else
12bae44b-2e7f-4a80-868a-983332b90429
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Rathsman, Johan
c71e9215-c7d9-45c4-888e-5a8ebf423657
Cederkäll, Joakim
dc613d0c-2af4-4188-8373-e6058cbea7dd
Hiçyılmaz, Yaşar
414f71c1-1f3f-4f2c-b579-d32277cb112c
Lytken, Else
12bae44b-2e7f-4a80-868a-983332b90429
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Rathsman, Johan
c71e9215-c7d9-45c4-888e-5a8ebf423657
[Unknown type: UNSPECIFIED]
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 12Cnuclei. Fits to the corresponding data point, as most probable explanation, to aspin-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.
Text
2509.15128v1
- Author's Original
Available under License Other.
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Accepted/In Press date: 18 September 2025
Keywords:
hep-ph
Identifiers
Local EPrints ID: 506695
URI: http://eprints.soton.ac.uk/id/eprint/506695
PURE UUID: c9263daf-4285-47da-8edd-396d1d6a1e20
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Date deposited: 14 Nov 2025 17:32
Last modified: 15 Nov 2025 02:40
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Author:
Joakim Cederkäll
Author:
Yaşar Hiçyılmaz
Author:
Else Lytken
Author:
Johan Rathsman
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