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 …

This article is a pedagogical review of searches for long-lived particles at the LHC. It is
primarily aimed at experimentalists and theorists seeking to initiate and/or deepen their …

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 The results of a search for Higgs boson pair (HH) production in the WW* WW*,
WW* ττ, and ττττ decay modes are presented. The search uses 138 fb− 1 of proton-proton …

This Letter describes a search for narrowly resonant new physics using a machine-learning
anomaly detection procedure that does not rely on signal simulations for developing the …

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 …

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 …

This document summarises the current theoretical and experimental status of the di-Higgs
boson production searches, and of the direct and indirect constraints on the Higgs boson …

Kinematic variables play an important role in collider phenomenology, as they expedite
discoveries of new particles by separating signal events from unwanted background events …

A bstract A search for new heavy resonances decaying to a pair of Higgs bosons (HH) in
proton-proton collisions at a center-of-mass energy of 13 TeV is presented. Data were …