Name: The X17 particle, status and new ideas
Start: 2026-03-23T08:55:00+01:00
End: 2026-03-27T19:00:00+01:00
Location: ECT*

The X17 particle, status and new ideas

from Monday, March 23, 2026 (8:55 AM) to Friday, March 27, 2026 (7:00 PM)

Monday, March 23, 2026

9:00 AM REGISTRATION
REGISTRATION
9:00 AM - 10:00 AM
Room: Aula Renzo Leonardi
10:00 AM Workshop Overview — Organizers - Luca Doria (Johannes Gutenberg University Mainz) Carlo Gustavino Elena Filandri (ECT*) Michele Viviani (INFN - Pisa)
Workshop Overview — Organizers
- Luca Doria (Johannes Gutenberg University Mainz)
- Carlo Gustavino
- Elena Filandri (ECT*)
- Michele Viviani (INFN - Pisa)
10:00 AM - 10:30 AM
Room: Aula Renzo Leonardi
10:30 AM Coffee Break
Coffee Break
10:30 AM - 11:00 AM
Room: Villa Tambosi
11:00 AM Experiments to Detect the X17 Particle - Attila Krasznahorkay (HUN-REN ATOMKI)
Experiments to Detect the X17 Particle
- Attila Krasznahorkay (HUN-REN ATOMKI)
11:00 AM - 12:00 PM
Room: Aula Renzo Leonardi
12:00 PM Lunch
Lunch
12:00 PM - 2:00 PM
Room: Villa Tambosi
2:00 PM Dark Photon Search with MAGIX at MESA - Stefan Merkel (Institute for Nuclear Physics, Johannes Gutenberg University Mainz)
Dark Photon Search with MAGIX at MESA
- Stefan Merkel (Institute for Nuclear Physics, Johannes Gutenberg University Mainz)
2:00 PM - 2:40 PM
Room: Aula Renzo Leonardi
2:40 PM DarkLight: a Model-Independent Search for the X17 - Ethan Cline (Stony Brook University, Stony Brook/US)
DarkLight: a Model-Independent Search for the X17
- Ethan Cline (Stony Brook University, Stony Brook/US)
2:40 PM - 3:20 PM
Room: Aula Renzo Leonardi
3:20 PM TBA (TRIUMF-614) - Michael Hasinoff (University of British Columbia)
TBA (TRIUMF-614)
- Michael Hasinoff (University of British Columbia)
3:20 PM - 4:00 PM
Room: Aula Renzo Leonardi
4:00 PM Coffee Break
Coffee Break
4:00 PM - 4:30 PM
Room: Villa Tambosi
4:30 PM Welcome — ECT* Director - Ubirajara van Kolck (ECT*, Trento)
Welcome — ECT* Director
- Ubirajara van Kolck (ECT*, Trento)
4:30 PM - 5:00 PM
Room: Aula Renzo Leonardi
5:00 PM Discussion
Discussion
5:00 PM - 6:00 PM
Room: Aula Renzo Leonardi

8:00 PM Welcome pizza
Welcome pizza
8:00 PM - 9:00 PM
Room: TRENTO
Tuesday, March 24, 2026
9:00 AM Highlights of the LNF/X17 workshop - Fabio Bossi (INFN Frascati)
Highlights of the LNF/X17 workshop
- Fabio Bossi (INFN Frascati)
9:00 AM - 9:40 AM
Room: Aula Renzo Leonardi
9:40 AM The X17 search with the MEG-II apparatus - Hicham Benmansour (INFN)
The X17 search with the MEG-II apparatus
- Hicham Benmansour (INFN)
9:40 AM - 10:20 AM
Room: Aula Renzo Leonardi
10:20 AM Coffee Break
Coffee Break
10:20 AM - 10:50 AM
Room: Villa Tambosi
10:50 AM Probing the Existence and Properties of the X17 Boson Using Proton and Neutron Beams - Carlo Gustavino
Probing the Existence and Properties of the X17 Boson Using Proton and Neutron Beams
- Carlo Gustavino
10:50 AM - 11:30 AM
Room: Aula Renzo Leonardi
11:30 AM Study of the Anomalous Internal Pair Creation in Be at LNL-INFN - Benito Gongora Servin (University of Padova / INFN-PD)
Study of the Anomalous Internal Pair Creation in Be at LNL-INFN
- Benito Gongora Servin (University of Padova / INFN-PD)
11:30 AM - 12:10 PM
Room: Aula Renzo Leonardi
12:10 PM Status of the PADME X17 Search - Mauro Raggi (Sapienza University and INFN Roma1)
Status of the PADME X17 Search
- Mauro Raggi (Sapienza University and INFN Roma1)
12:10 PM - 12:50 PM
Room: Aula Renzo Leonardi
12:50 PM Lunch
Lunch
12:50 PM - 2:50 PM
Room: Villa Tambosi
2:50 PM Ongoing Search for X17 at the LHCb Experiment - Martino Borsato (Milano-Bicocca University and INFN)
Ongoing Search for X17 at the LHCb Experiment
- Martino Borsato (Milano-Bicocca University and INFN)
2:50 PM - 3:30 PM
Room: Aula Renzo Leonardi
3:30 PM Searching for the X17 Particle with the NA64 Experiment at CERN SPS - Luca Marsicano
Searching for the X17 Particle with the NA64 Experiment at CERN SPS
- Luca Marsicano
3:30 PM - 4:10 PM
Room: Aula Renzo Leonardi
4:10 PM Coffee Break
Coffee Break
4:10 PM - 4:40 PM
Room: Villa Tambosi

4:40 PM Discussion
Discussion
4:40 PM - 6:00 PM
Room: Aula Renzo Leonardi
Wednesday, March 25, 2026
9:00 AM Ab Initio Calculations of p-Induced e+e− Processes - Petr Navratil (TRIUMF)
Ab Initio Calculations of p-Induced e+e− Processes
- Petr Navratil (TRIUMF)
9:00 AM - 9:40 AM
Room: Aula Renzo Leonardi
9:40 AM Ab-Initio Studies of A=3,4 Nuclear Processes and X17 - Laura Elisa Marcucci (University of Pisa and INFN-Pisa)
Ab-Initio Studies of A=3,4 Nuclear Processes and X17
- Laura Elisa Marcucci (University of Pisa and INFN-Pisa)
9:40 AM - 10:20 AM
Room: Aula Renzo Leonardi
10:20 AM Coffee Break
Coffee Break
10:20 AM - 10:50 AM
Room: Villa Tambosi
10:50 AM Constraining the Axial-Vector X17 Interpretation with 12C Data - Cornelis Mommers (Johannes Gutenberg University Mainz)
Constraining the Axial-Vector X17 Interpretation with 12C Data
- Cornelis Mommers (Johannes Gutenberg University Mainz)
10:50 AM - 11:30 AM
Room: Aula Renzo Leonardi
11:30 AM Pair Production in p+LiF Reactions - Aldo Bonasera (Texas A&M,USA and LNS-INFN, Italy)
Pair Production in p+LiF Reactions
- Aldo Bonasera (Texas A&M,USA and LNS-INFN, Italy)
11:30 AM - 12:10 PM
Room: Aula Renzo Leonardi
12:10 PM Lunch
Lunch
12:10 PM - 2:00 PM
Room: Villa Tambosi
2:00 PM Kaon Decay Constraints on Vector Bosons Coupled to Non-Conserved Currents - Adrian Thompson (Northwestern University)
Kaon Decay Constraints on Vector Bosons Coupled to Non-Conserved Currents
- Adrian Thompson (Northwestern University)
2:00 PM - 2:40 PM
Room: Aula Renzo Leonardi
2:40 PM Probing the X17 using Coherent Elastic Neutrino Nucleus Scattering - Johan Rathsman (Department of physics, Lund University)
Probing the X17 using Coherent Elastic Neutrino Nucleus Scattering
- Johan Rathsman (Department of physics, Lund University)
2:40 PM - 3:20 PM
Room: Aula Renzo Leonardi
3:20 PM Coffee Break
Coffee Break
3:20 PM - 3:50 PM
Room: Villa Tambosi
3:50 PM Experimental Plan for the X17 Particle Search at Fudan University - Jie Zhao (Fudan University)
Experimental Plan for the X17 Particle Search at Fudan University
- Jie Zhao (Fudan University)
3:50 PM - 4:10 PM
Room: Aula Renzo Leonardi
4:10 PM Discussion
Discussion
4:10 PM - 6:00 PM
Room: Aula Renzo Leonardi

8:00 PM Social dinner
Social dinner
8:00 PM - 9:00 PM
Room: TRENTO
Thursday, March 26, 2026
9:00 AM The X17 in U(1)'-Extended 2HDMs - Stefano Moretti (University of Southampton (UK) & Uppsala University (Sweden))
The X17 in U(1)'-Extended 2HDMs
- Stefano Moretti (University of Southampton (UK) & Uppsala University (Sweden))
9:00 AM - 9:40 AM
Room: Aula Renzo Leonardi
9:40 AM Constraining the X17: Neutrino NSI and IceCube Data - Yasar Hicyilmaz (Balikesir University)
Constraining the X17: Neutrino NSI and IceCube Data
- Yasar Hicyilmaz (Balikesir University)
9:40 AM - 10:20 AM
Room: Aula Renzo Leonardi
10:20 AM Coffee Break
Coffee Break
10:20 AM - 10:50 AM
Room: Villa Tambosi
10:50 AM The X17 with Chiral Couplings - Max Fieg
The X17 with Chiral Couplings
- Max Fieg
10:50 AM - 11:30 AM
Room: Aula Renzo Leonardi
11:30 AM An Updated View on Parity-Conserving X17 Scenarios - Claudio Toni (LAPTh, CNRS)
An Updated View on Parity-Conserving X17 Scenarios
- Claudio Toni (LAPTh, CNRS)
11:30 AM - 12:10 PM
Room: Aula Renzo Leonardi
12:10 PM Lunch
Lunch
12:10 PM - 2:00 PM
Room: Villa Tambosi
2:00 PM X17 as a Protophobic Vector: Viable Couplings and Gaussian-Process Resonance Search Methods - Emrys Peets (Stanford University, SLAC National Accelerator Laboratory)
X17 as a Protophobic Vector: Viable Couplings and Gaussian-Process Resonance Search Methods
- Emrys Peets (Stanford University, SLAC National Accelerator Laboratory)
2:00 PM - 2:40 PM
Room: Aula Renzo Leonardi
2:40 PM Axion-Like Electrophilic Portal for Pion Dark Matter - Vincenzo Fiorentino
Axion-Like Electrophilic Portal for Pion Dark Matter
- Vincenzo Fiorentino
2:40 PM - 3:20 PM
Room: Aula Renzo Leonardi
3:20 PM Searching for Light Dark Particles with η and η′ Mesons - Sergi Gonzalez-Solis (Universitat de Barcelona & Institute of Cosmos Sciences)
Searching for Light Dark Particles with η and η′ Mesons
- Sergi Gonzalez-Solis (Universitat de Barcelona & Institute of Cosmos Sciences)
3:20 PM - 4:00 PM
Room: Aula Renzo Leonardi
4:00 PM Coffee Break
Coffee Break
4:00 PM - 4:30 PM
Room: Villa Tambosi
4:30 PM Light Dark Sector via Thermal Decays of Dark Matter - Marco Graziani (INFN, Sezione di Roma)
Light Dark Sector via Thermal Decays of Dark Matter
- Marco Graziani (INFN, Sezione di Roma)
4:30 PM - 5:10 PM
Room: Aula Renzo Leonardi
5:10 PM Discussion
Discussion
5:10 PM - 6:00 PM
Room: Aula Renzo Leonardi
Friday, March 27, 2026
10:00 AM Light Boson Searches with New JEDI: Current Results and Perspectives - Beyhan Bastin (GANIL)
Light Boson Searches with New JEDI: Current Results and Perspectives
- Beyhan Bastin (GANIL)
10:00 AM - 10:40 AM
Room: Aula Renzo Leonardi
10:40 AM Coffee Break
Coffee Break
10:40 AM - 11:10 AM
Room: Villa Tambosi

11:10 AM Group picture
Group picture
11:10 AM - 11:15 AM
Room: Aula Renzo Leonardi
11:15 AM The Montreal X17 Experiment: Status Report - Luca Doria (Johannes Gutenberg University Mainz)
The Montreal X17 Experiment: Status Report
- Luca Doria (Johannes Gutenberg University Mainz)
11:15 AM - 11:30 AM
Room: Aula Renzo Leonardi
11:30 AM Final Remarks and Conclusions
Final Remarks and Conclusions
11:30 AM - 12:00 PM
Room: Aula Renzo Leonardi

12:00 PM Lunch
Lunch
12:00 PM - 2:00 PM
Room: Villa Tambosi

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