https://doi.org/10.1140/epjc/s10052-023-11271-x
Review
Shedding light on X17: community report
1
Theoretical Division, Los Alamos National Laboratory, 87544, Los Alamos, NM, USA
2
Dip. di Fisica Sapienza Univ., p.le A. Moro 2, Rome, Italy
3
INFN sez. Roma, p.le A. Moro 2, Rome, Italy
4
Institut de Physique des 2 Infinis de Lyon (IP2I), UMR5822, CNRS/IN2P3, 69622, Villeurbanne Cedex, France
5
Institut de Fisica d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193, Bellaterra, Barcelona, Spain
6
Dipartimento di Fisica, Università della Calabria, 87036, Arcavacata di Rende, Cosenza, Italy
7
Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45 D, 55128, Mainz, Germany
8
Department of Physics and Astronomy, University of California, 92697, Los Angeles, CA, USA
9
Department of Physics, Princeton University, Princeton, USA
10
North Carolina A &T State University, 27411, Greensboro, NC, USA
11
School of Physics and Astronomy, University of Birmingham, Edgbaston, B15 2TT, Birmingham, UK
12
Center for Fundamental Physics, Zewail City of Science and Technology, 6 October City, 12588, Giza, Egypt
13
Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., 1164, Sofia, Bulgaria
14
Institute for Nuclear Research (Atomki), P.O. Box 51, 4001, Debrecen, Hungary
15
INFN-Laboratori Nazionali di Legnaro, Legnaro, PD, Italy
16
Department of Physics, University of Washington, 98195, Seattle, WA, USA
17
School of Physics and Astronomy, University of Southampton, SO17 1BJ, Southampton, UK
18
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, C.P. 13, 00044, Frascati, Italy
19
Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, Czech Republic
20
Paul Scherrer Institute, Würenlingen, Switzerland
21
Institute of Experimental Particle Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany
22
Physics Division, Oak Ridge National Laboratory, Oak Ridge, USA
23
Facility for Rare Isotope Beams, Michigan State University, 48824, East Lansing, MI, USA
Received:
15
June
2022
Accepted:
23
January
2023
Published online:
20
March
2023
The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new light particle, often referred to as X17. This hypothetical particle can explain the resonant structure observed at 
17 MeV in the invariant mass of electron-positron pairs, produced after excitation of nuclei such as 
and 
by means of proton beams at the Atomki Laboratory in Debrecen. The purpose of the workshop is to discuss implications of this anomaly, in particular theoretical interpretations as well as present and future experiments aiming at confirming the result and/or at providing experimental evidence for its interpretation.
© The Author(s) 2023
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