Ana Henriques arrived at CERN in 1988 as a summer student, and never wanted to leave. She assumed the roles of technical coordinator and project leader of the ATLAS Tile Calorimeter, being involved in its design, construction, and installation processes.

In a new result, the ATLAS Collaboration reports the first evidence of a Higgs boson produced in association with a leptonically-decaying W or Z boson and decaying into a pair of tau leptons.

As we celebrate the 50th anniversary of the observation of neutral currents and the 40th anniversary of the W/Z boson discovery, we take a look back on the 13 years of ATLAS research into the weak force.

The ATLAS Collaboration has published three new results in this challenging area, using Boosted Decision Trees (BDTs) to isolate potential signals and ultimately set stringent constraints on the masses of SUSY particles.

On 16 November 2023 at 6pm CET, Dr. Ludovica Aperio Bella will give a live public talk on the ATLAS Youtube Channel about precision measurements at the LHC.

Lukas Kretschmann, a physics student at the University of Wuppertal in Germany, shares his journey in the ATLAS Collaboration – which began as a high-school student!

ATLAS Week is an opportunity for young physicists to present and discuss their work. ATLAS students Sarah and Bruna were at the last ATLAS Week in Vancouver, Canada, and share what the experience was like for them.

The ATLAS Collaboration has measured the production cross section of the J/ψ and ψ(2S) charmonium states in terms of the transverse momentum and the rapidity. For both states, they examined the widest range of transverse momentum so far, thus providing new input for theoretical models.

The ATLAS and CMS Experiments at CERN have just released a new measurement of the mass of the top quark. The new result combines 15 previous measurements to give the most precise determination of the top quark mass to date.

In a new result from the ATLAS Collaboration, physicists observed – for the first time – quantum entanglement between a pair of quarks. This is the highest-energy measurement of entanglement to date.

The result showcases the power of the LHC to push the precision frontier and improve our understanding of nature.

The ATLAS Collaboration has released two brand-new results searching for di-Higgs events in the full LHC Run-2 dataset. In one, researchers looked for events where one Higgs boson decays into two bottom quarks and the other decays into two photons. In the other, they looked for events where one Higgs boson decays into two bottom quarks, and the other into two tau leptons or W/Z bosons, which subsequently decay into leptons.

On 14 September at 6pm CEST, Dr. Martin Rybar and Dr. Peter Steinberg will give a live public talk on the ATLAS Youtube Channel on how the ATLAS experiment records heavy-ion collisions.

For many students, a summer internship is a rite of passage — and a gateway to future jobs. Looking for a valuable glimpse into what a future in physics might hold, dozens of university students from around the world headed to CERN to participate in the Summer Student Programme and engage with cutting-edge scientific research at the ATLAS Experiment. With the support of their supervisors, these students have been deepening their knowledge of particle physics, engineering and computing through challenging projects. These are the stories of 12 of these students.

The ATLAS Collaboration at CERN observes the production of top-quark pairs in proton-lead ion collisions. ATLAS’ new result confirms and builds upon an earlier observation made by the CMS Collaboration, expanding it into a new decay channel.

For the very first time, the ATLAS Collaboration has searched for dark jets that closely resemble QCD jets. Instead of originating from Standard-Model particles, these dark jets would be produced through a new, heavy particle called the Z' boson.

The ATLAS Collaboration has prepared a variety of new results for the Quark Matter conference, focusing on the study of collisions involving lead ions, xenon, and lead ions with protons.

The ATLAS Collaboration has just released a new measurement of the production cross section of two Z bosons. This highlight result examines data collected during Run 3 of the LHC and pioneers the use of PHYSLITE, a new, reduced data format that requires significantly less storage.

In a new paper submitted to Phys. Rev. Lett., the ATLAS Collaboration pioneers the use of unsupervised machine learning to search for anomalous collision events which could be from new physics phenomena.

In a new study presented at the EPS-HEP 2023 conference, the ATLAS Collaboration combed through the full LHC Run-2 dataset (recorded 2015-2018) in search for magnetic monopoles and HECOs (see Figure 1). The result places some of the tightest limits yet on the production rate of magnetic monopoles.

In new results presented today, the ATLAS Collaboration provides its most comprehensive overview of the searches for weakly-interacting supersymmetric particles. By developing new search algorithms and exploiting machine learning techniques, researchers have probed deep into this difficult-to-reach territory.

The ATLAS Collaboration has announced the first observation of two different tri-boson processes: the simultaneous production of a W boson with two photons (Wγγ) and the production of a W boson, a Z boson and a photon (WZγ). The production of a Z boson with two photons (Zγγ) was first observed in 2016 using data from LHC Run 1 (2010-2013). In a new publication, the ATLAS Collaboration expanded the scope of this initial observation using Run 2 data.

Vector boson scattering processes play a special role within the Standard Model, as they are closely related to the Higgs mechanism and can proceed via an exchange of a Higgs boson. By studying these processes, ATLAS physicists are exploring multiple new-physics models, including anomalous self-interactions of the W bosons and extended Higgs sector with additional Higgs bosons.

This week, ATLAS physicists presented four exciting new results about jet tagging using AI algorithms at the BOOST 2023 conference held at Lawrence Berkeley National Lab (USA).

The ATLAS Collaboration has released two new results explaining how detector timing measurements and calorimeter signal calibration using artificial intelligence (AI) are being used to further improve the quality of data recorded by the experiment.