Feebly-Interacting Particles:FIPs 2020 Workshop Report
Prateek Agrawal, Martin Bauer, James Beacham, Asher Berlin, Alexey Boyarsky, Susana Cebrian, Xabier Cid-Vidal, David d'Enterria, Albert De Roeck, Marco Drewes, Bertrand Echenard, Maurizio Giannotti, Gian Francesco Giudice, Sergei Gninenko, Stefania Gori, Evgueni Goudzovski, Julian Heeck, Pilar Hernandez, Matheus Hostert, Igor Irastorza, Alexander Izmaylov, Joerg Jaeckel, Felix Kahlhoefer, Simon Knapen, Gordan Krnjaic, Gaia Lanfranchi, Jocelyn Monroe, Verena Martinez-Outschoorn, Jacobo Lopez-Pavon, Silvia Pascoli, Maxim Pospelov, Diego Redigolo, Andreas Ringwald, Oleg Ruchayskiy, Joshua Ruderman, Heather Russell, Jakob Salfeld-Nebgen, Philip Schuster, Mikhail Shaposhnikov, Lesya Shchutska, Jessie Shelton, Yotam Soreq, Yevgeny Stadnik, Joel Swallow, Kohsaku Tobioka, Yu-Dai Tsai
Abstract
With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop "Physics Beyond Colliders meets theory", held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.