In a new analysis from the ATLAS Collaboration, physicists merged five di-Higgs studies of LHC Run 2 data. By combining the power of all these decay channels, researchers achieved the most sensitive probe of di-Higgs production and the Higgs self-coupling.

Julia Gonski explains the long-established use of artificial intelligence and machine learning (AI/ML) in high-energy physics research and explores the exciting potential these technologies hold for the field.

In a new study submitted to Physical Review Letters, ATLAS scientists used a new algorithm to search for long-lived particles (LLP) produced in the decay of Higgs bosons. These LLPs may leave a distinct signature of one or more hadronic “jets” of particles originating at a significantly displaced position from the proton–proton collision point.

The twelfth annual conference on Large Hadron Collider physics (LHCP 2024) kicks off today in Boston, USA. This week-long event will feature a detailed review of the latest experimental and theoretical results in collider physics, including several final studies of the LHC Run-2 dataset (collected in 2015-2018) and discussions on future research directions for the high-energy particle-physics community.

The ATLAS Collaboration has just published a search for two new Higgs bosons, X and S, that would interact with the Standard-Model Higgs boson.

If spotting one Higgs boson is interesting, what happens when you spot two? ATLAS researchers are looking for the production of two Higgs bosons using a new technique.

Using the full LHC Run-2 dataset, the ATLAS Collaboration measured Z boson production in association with both bottom (b) and charm (c) quarks, the latter for the first time in ATLAS.

New results released by the ATLAS Collaboration describe the significant advancements made in identifying electrons and photons.

The ATLAS Collaboration mourns the passing of renowned physicist Peter Higgs, whose theoretical work on elucidating the fundamental spontaneous symmetry-breaking mechanism by which elementary particles acquire mass reshaped our understanding of the Universe.

In a groundbreaking new result, the ATLAS Collaboration has measured the W-boson width for the first time at the Large Hadron Collider (LHC).

The ATLAS Collaboration has just released its first measurements using LHC Run-3 data of the production rates (“cross sections”) of W and Z bosons.

In a new result presented at Moriond EW, physicists at the ATLAS Collaboration tested lepton flavour universality between muons and electrons. The precision of the result stands as the best yet-achieved in W-boson decays by a single experiment and surpasses the world average.

This year, the start of Spring marks the beginning of the conference season for particle physicists! All eyes turn to La Thuile, Italy, where the annual Recontres de Moriond conferences will be held.

In a new result, researchers conducted a novel search of data collected during Run 2 of the LHC, searching for heavy new particles that could fit the 2HDM or 2HDM+S models.

The ATLAS Collaboration at CERN welcomes a new member to its management team. Martin Aleksa (CERN) joins as Technical Coordinator for the experiment, picking up the torch from Ludovico Pontecorvo (CERN).

The ATLAS Collaboration celebrated the achievements of its exceptional PhD students at the recent Thesis Awards ceremony. Established in 2010, the ATLAS Thesis Awards recognize the remarkable contributions made by students to the ATLAS Collaboration through their doctoral theses.

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.