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 …

This report reviews the published results of searches for possible additional scalar particles
and exotic decays of the Higgs boson performed by the ATLAS Collaboration using up to …

The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented,
with $ pp $ collisions at $\sqrt {s}= 13$ TeV. The absolute luminosity scale is determined …

The standard model of particle physics,,–describes the known fundamental particles and
forces that make up our Universe, with the exception of gravity. One of the central features of …

The ATLAS experiment has developed extensive software and distributed computing
systems for Run 3 of the LHC. These systems are described in detail, including software …

The identification of $ b $-jets, referred to as $ b $-tagging, is an important part of many
physics analyses in the ATLAS experiment at the Large Hadron Collider and an accurate …

Entanglement is a key feature of quantum mechanics1–3, with applications in fields such as
metrology, cryptography, quantum information and quantum computation4–8. It has been …

A bstract Precision measurements of electron reconstruction, identification, and isolation
efficiencies and photon identification efficiencies are presented. They use the full Run 2 data …

This paper presents the observation of four-top-quark (tt¯ tt¯) production in proton-proton
collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb-1 at …

This paper presents the muon momentum calibration and performance studies for the
ATLAS detector based on the pp collisions data sample produced at s= 13 TeV at the LHC …