A major milestone has been reached in the construction of the ATLAS Inner Tracker (ITk), with the installation of the first nine production ‘petals’ of the ITk Strips Endcap at DESY in Germany.

CERN teams successfully complete the first major transport operation of LS3. A 77-tonne shielding component, known as the JFSU, moves from the surface hall above the ATLAS experiment to Building 191 on CERN’s main site.

Summary of new ATLAS results presented at the 2026 International Conference on High Energy Physics (ICHEP).

After more than a decade of service, one of the LHC’s key components for guiding particle beams through the ATLAS experiment has been removed, making way for the High-Luminosity LHC era.

Hamamatsu Photonics K.K. was announced as the 2026 Industrial Award winner by the ATLAS and CMS Collaborations at a dedicated ceremony on 15 July 2026.

A major relocation campaign has been launched to dismantle one of the ATLAS experiment’s key computing systems and transport it from LHC Point 1 to its new home at LHC Point 8, the site of the LHCb experiment.

At 05:52 a.m. on 27 June 2026, the final protons of the Large Hadron Collider's third data-taking period circulated through the accelerator, bringing Run 3 to a close and marking the end of a remarkable chapter in particle physics. The next several years will be devoted to transforming both the LHC and the ATLAS experiment for the High-Luminosity LHC (HL-LHC), an ambitious upgrade programme that will culminate in the return of particle beams in 2030.

For three weeks in April 2026, the Large Hadron Collider did something counterintuitive: it eased off the throttle. Instead of maximising collision rates, the accelerator entered a deliberately quieter operating mode. This shift offered the ATLAS Collaboration a rare opportunity to study fundamental particles in an exceptionally clean experimental environment.

Summary of new ATLAS results presented at the Rencontres de Moriond conferences 2026.

On 19 February 2026, the ATLAS Collaboration gathered in CERN’s Main Auditorium for the 2025 Thesis Awards – an annual celebration of the vital role of PhD students within the experiment.

Lidia Dell'Asta, Jacob Julian Kempster and Daniele Zanzi describe how the ATLAS Collaboration is probing forbidden flavour-changing and lepton-flavour-violating processes as powerful tests of the Standard Model’s limits.

The first high-energy collisions between light nuclei at the Large Hadron Collider confirm the unusual “bowling-pin” shape of neon nuclei and offer up a new tool to study the extreme state of matter produced in the aftermath of the Big Bang.

The CMS and ATLAS experiments at CERN’s Large Hadron Collider have observed an unforeseen feature in the behaviour of top quarks that suggests that these heaviest of all elementary particles form a fleeting union.

The ATLAS Collaboration is set to make waves at the EPS-HEP 2025 conference, unveiling a wide range of new results.

The ATLAS Experiment at CERN dives into uncharted waters, recording its first-ever collisions of oxygen and neon ions. These are not your typical heavy-ion collisions. Oxygen and neon nuclei are far smaller than lead – the LHC’s usual candidate for ion runs – and offer physicists exciting new opportunities to study the strong force.

The ATLAS Collaboration celebrated the dedication, ingenuity and collaborative spirit of its members at the 8th Outstanding Achievement Awards.

Last week, the ATLAS Collaboration presented new results at the Quark Matter 2025 conference, held in Frankfurt am Main (Germany). From detailed studies of the quark-gluon plasma’s collective motion to new measurements in ultra-peripheral collisions, ATLAS is providing new insight into the fascinating behaviour of heavy-ion collisions and the quark–gluon structure of nuclei.

Last week, at the Rencontres de Moriond conference, the ATLAS Collaboration brought physicists a step closer to understanding the nature of the electroweak symmetry-breaking mechanism.

The ATLAS Collaboration at CERN has been awarded the Breakthrough Prize in Fundamental Physics for its pioneering studies of the high-energy collisions from the Large Hadron Collider (LHC).

While the discovery of the Higgs boson in 2012 by the ATLAS and CMS Collaborations remains the LHC's crowning achievement, the ATLAS Collaboration has since produced a wealth of groundbreaking results that continue to reshape particle physics. In this feature article, Andreas Hoecker delves into the remarkable breakthroughs uncovered by ATLAS using Run 2 data.

This weekend, the ALICE, ATLAS, CMS and LHCb collaborations at the Large Hadron Collider at CERN were honoured with the Breakthrough Prize in Fundamental Physics by the Breakthrough Prize Foundation. The prize is awarded to the four collaborations, which unite thousands of researchers from more than 70 countries, and concerns the papers authored based on LHC Run-2 data up to July 2024. It was received by the spokespersons who led the collaborations during that time.

The ATLAS Collaboration submitted four documents to the European Strategy Group (ESG), namely, an overview of the extensive ATLAS detector upgrade for the HL-LHC, a summary of the software and computing preparations to address the HL-LHC challenges, a joint update with CMS on HL-LHC physics expectations, and a joint document on prospectives for flavour physics.

Every Spring, all eyes turn to La Thuile (Italy) for the arrival of the annual Recontres de Moriond conferences. Explore the full list of new ATLAS results presented at Moriond.

The ATLAS Collaboration embarks on a new chapter under the leadership of Spokesperson Stéphane Willocq (University of Massachusetts Amherst).

Among the more than 5500 members of the ATLAS Collaboration, PhD students play a vital role in advancing the experiment while pursuing their degrees. Every year, the ATLAS Thesis Awards celebrate their outstanding achievements, recognising the significant impact of their research on physics analyses, detector advancements, and software development.