This report presents a comprehensive collection of searches for new physics performed by
the ATLAS Collaboration during the Run 2 period of data taking at the Large Hadron …

In this work, we consider the case of a strongly coupled dark/hidden sector, which extends
the Standard Model (SM) by adding an additional non-Abelian gauge group. These …

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 …

A bstract We study the capabilities of a muon collider experiment to detect disappearing
tracks originating when a heavy and electrically charged long-lived particle decays via X+→ …

A search is presented for a heavy resonance Y decaying into a Standard Model Higgs
boson H and a new particle X in a fully hadronic final state. The full Large Hadron Collider …

A bstract The first collider search for dark matter arising from a strongly coupled hidden
sector is presented and uses a data sample corresponding to 138 fb− 1, collected with the …

We provide five benchmark hidden valley models with perturbative parton showers, which
span a wide range of dark shower phenomenology. We consider production through an s …

Semi-visible jets, with a significant contribution to the event's missing transverse momentum,
can arise in strongly interacting dark sectors. This results in an event topology where one of …

A bstract This paper presents a search for a new Z′ resonance decaying into a pair of dark
quarks which hadronise into dark hadrons before promptly decaying back as Standard …

Strongly interacting dark sectors predict novel LHC signatures such as semi-visible jets
resulting from dark showers that contain both stable and unstable dark mesons …