We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a
comprehensive survey of standard model (SM) extensions. LLPs are a common prediction of …

We present an overview of scenarios where the observed Dark Matter (DM) abundance
consists of Feebly Interacting Massive Particles (FIMPs), produced nonthermally by the so …

Abstract Particles beyond the Standard Model (SM) can generically have lifetimes that are
long compared to SM particles at the weak scale. When produced at experiments such as …

An inclusive search is presented for long-lived particles using displaced jets. The search
uses a data sample collected with the CMS detector at the CERN LHC in 2017 and 2018 …

Despite decades of attempts to reveal its flaws, the Standard Model of particle physics (SM)
has withstood all experimental tests and its predictions are in excellent agreement with data …

Colliders, among the most successful tools of particle physics, have revealed much about
matter. This review describes how colliders contribute to the search for particle dark matter …

This document presents the physics case and ancillary studies for the proposed CODEX-b
long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator …

Abstract Feebly Interacting Massive Particles (FIMPs) are dark matter candidates that never
thermalize in the early universe and whose production takes place via decays and/or …

We investigate the production of particle Dark Matter (DM) in a minimal freeze-in model
considering a non-instantaneous reheating phase after inflation. We demonstrate that for …

A search is presented for long-lived particles produced in pairs in proton-proton collisions at
the LHC operating at a center-of-mass energy of 13 TeV. The data were collected with the …