Feebly-Interacting Particles:FIPs 2020 Workshop Report

TL;DR

The FIPs 2020 workshop report summarizes recent advances in the study of light, feebly-interacting particles across collider, astrophysics, and neutrino experiments, highlighting experimental progress and theoretical models in this emerging field.

Contribution

This report consolidates interdisciplinary efforts and discusses experimental and theoretical developments in feebly-interacting particles, fostering cross-field collaboration and outlining future research directions.

Findings

Progress in experimental searches for FIPs across multiple platforms

Development of new theoretical models for FIPs physics

Recommendations for future experimental efforts

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.