Abstract
Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent fine-tuning of the electro-weak scale, and many other aspects of fundamental physics. Perhaps the most striking frontier to emerge in the search for answers involves new physics at mass scales comparable to familiar matter, below the GeV-scale, or even radically below, down to sub-eV scales, and with very feeble interaction strength. New theoretical ideas to address dark matter and other fundamental questions predict such feebly interacting particles (FIPs) at these scales, and indeed, existing data provide numerous hints for such possibility. A vibrant experimental program to discover such physics is under way, guided by a systematic theoretical approach firmly grounded on the underlying principles of the Standard Model. This document represents the report of the FIPs 2022 workshop, held at CERN between the 17 and 21 October 2022 and aims to give an overview of these efforts, their motivations, and the decadal goals that animate the community involved in the search for FIPs.
| Original language | English |
|---|---|
| Article number | 1122 |
| Number of pages | 266 |
| Journal | European Physical Journal C |
| Volume | 83 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 11 Dec 2023 |
Bibliographical note
Acknowledgments:We thank CERN and the Physics Beyond Colliders study group for the support during the organization of the workshop and we acknowledge the invaluable help of the secretariat team, P. Mage-Granados and C. Cazenoves, that allowed us to smoothly run a workshop with hundreds of participants. We are grateful to the colleagues that helped in steering the scientific programme of the workshop, namely: T. Ferben, P. Hernandez, G. F. Giudice, I.Irastorza, J. Jaeckel, J. Monroe, P. Schuster, and M. Shaposhnikov for interesting discussions and exchanges. C. Sun is supported by LDRD at Los Alamos National Laboratory (US) and this report is published under report number LA-UR-23-21432. G. Lanfranchi, C. Gatti and A. Paoloni are supported by INFN, Laboratori Nazionali di Frascati (Italy) and this work is published under the report number INFN-23-14-LNF. M. Battaglieri’s contribution is supported by Jefferson Laboratory (US) and this report is published with the report number JLAB-PHY-23-3789. F. Kling and A. Lindner are supported by the DESY Laboratory (Germany) and this work is published under the number DESY-23-050. N.Tran’s work is supported by Fermi National Laboratory (US) and this report is published under the number FERMILAB-PUB-23-149-PPD. J. Kopp is supported by CERN Theory Department and by the Mainz Excellence Centre and this report is published under CERN-TH-2023-061 and MITP-23-015 report numbers. B. Wallisch acknowledges support from the Swedish Research Council under Grant 638-2013-8993. C. Gatti’s contribution is supported by EU through FET Open SUPERGALAX project, grant agreement N.863313. H. Grote’s contribution has been supported by the STFC in the UK, research grants ST/T006331/1 and ST/W006456/1 and The Leverhulme Trust in the UK, research grant RPG-2019-022. Y. V. Stadnik was supported by the Australian Research Council under the Discovery Early Career Researcher Award DE210101593. F. Kling acknowledges support by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy – EXC 2121 Quantum Universe – 390833306. V.V. Flambaum work was supported by the Australian Research Council Grants No. DP230101058 and DP200100150. J. Martin is grateful to those who provided updates on their experiments, namely: S. Degenkolb, P. Fierlinger, T. Ito, B. Lauss, F. Piegsa, G. Pignol, B. Plaster, A. Serebrov, J. Thorne and the author’s collaborators on the TUCAN project, principally B. Franke, T. Higuchi, S. Kawasaki, and R. Picker. J. Martin’s work was supported in part by the Natural Sciences and Engineering Research Council Canada, Canada Foundation for Innovation, and the Canada Research Chairs program. L. Li is supported by the DOE grant DE-SC-0010010, the NASA grant 80NSSC18K1010 and 80NSSC22K081. P. Foldenauer acknowledges support by the Spanish Agencia Estatal de Investigación through the grants PID2021-125331NB-I00 and CEX2020-001007-S, funded by MCIN/AEI/10.13039/501100011033. The work of P. Carenza is supported by the European Research Council under Grant No. 742104 and by the Swedish Research Council (VR) under grants 2018-03641 and 2019-02337. A special acknowledgment to Giuseppe Lucente for help in the preparation of the figures. S. Ulmer acknowledges the technical support by CERN, especially the Antiproton Decelerator operation group, CERN’s cryolab team and engineering department, and all other CERN groups which provide support to Antiproton Decelerator experiments and the financial support by RIKEN, the RIKEN EEE pioneering project funding, the RIKEN SPDR and JRA program, the Max-Planck Society, and the Max-Planck, RIKEN, PTB-Center for Time, Constants, and Fundamental Symmetries (C-TCFS). F. Calore acknowledges funding by the “Agence Nationale de la Recherche”, grant n. ANR-19-CE31-0005-01. L. Darmé is supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 101028626. M. Battaglieri’s contribution is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177 and this work is published under the report number JLAB-PHY-23-3789. N. Tran’s contribution is supported by the Fermi National Laboratory and this work his published under the report number FERMILAB-PUB-23-149-PPD. P. Crivelli would like to acknowledge the NA64 collaboration and in particular S. Gninenko, L. Molina-Bueno and V. Poliakov. Special thanks also to the past and current ETHZ members, notably E. Depero, H. Sieber, B. Banto-Oberhauser, M. Mongillo, A. Ponten. A big thank you also to the CERN beam department: D. Banerjee, J. Bernhard, N. Charitonidis, M. Brugger for their continuous support and expresses gratitude to the CERN SPSC members and NA64 referees who were fundamental for the success of NA64: particularly C. Vallé, G. Lanfranchi, G. Salam, L. Gatignon, M. Wing and G. Schnell. P. Crivelli’s work is supported by ETHZ and the Swiss National Science Foundation (SNSF) under the Grants No. 169133 and 186158. R. Pottgen gratefully acknowledges the support through the Swedish Research Council, grant nr 2019-03436. S. Urrea acknowledges support from Generalitat Valenciana through the plan GenT program (CIDEGENT/2018/019). F. Deppisch would like to thank Patrick Bolton, Bhupal Dev, Mudit Rai and Zhong Zhang for collaborations on which this proceedings report is mainly based on and acknowledges support from the UK Science and Technology Facilities Council (STFC) via the Consolidated Grant ST/T000880/1. M. C. Gonzales-Garcia has received funding/support from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 860881-HIDDeN, as well as from grant PID2019-105614GB-C21, “Unit of Excellence Maria de Maeztu 2020-2023” award to the ICC-UB CEX2019-000918-M, funded by MCIN/AEI/10.13039/501100011033, and by USA-NSF grant PHY-1915093. J. L. Tastet is grateful to Oleg Ruchayskiy, Pavlo Kashko and Inar Timiryasov for stimulating discussions about various methods for simplifying the reinterpretation of HNL searches. He acknowledges partial financial support by the Spanish Research Agency (Agencia Estatal de Investigación) through the grant IFT Centro de Excelencia Severo Ochoa No CEX2020-001007-S, by the grant PID2019-108892RB-I00 funded by MCIN/AEI/ 10.13039/501100011033, by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 860881-HIDDeN, and by the grant Juan de la Cierva FJC2021-047666-I funded by MCIN/AEI/10.13039/501100011033 and by the European Union “NextGenerationEU”/PRTR. D. Milstead gratefully acknowledges the Swedish Research Council for support for the design of the HIBEAM program. The work for NNBAR is part of the HighNESS project supported by the European Union Framework Programme for Research and Innovation Horizon2020 initiative for the HighNESS project under grant agreement 951782. P. Coloma’s work has received support from the IFT Centro de Excelencia Severo Ochoa Grant No. CEX2020-001007-S and by Grant PID2019-108892RB-I00 (funded by MCIN/AEI/10.13039/501100011033), and from Grant RYC2018-024240-I (funded by MCIN/AEI/10.13039/501100011033 and by “ESF Investing in your future”). P. Coloma’s work has also received partial funding/support from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 860881-HIDDeN. J. Shelton’s work was partially supported by US Department of Energy grant grant DE-SC0023365. B. Velghe’s contribution is supported by NSERC (Natural Sciences and Engineering Research Council), funding SAPPJ-2018-0017, Canada. J. Lopez-Pavon acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 860881-HIDDeN and the Marie Skłodowska-Curie Staff Exchange grant agreement No 101086085 - ASYMMETRY, the Generalitat Valenciana through the plan GenT program (CIDEGENT/2018/019), and from the Spanish Ministerio de Ciencia e Innovacion through the project PID2020-113644GB-I00.