ATLAS confirms mild tension in production of top-quark pairs with a W boson
The ATLAS Collaboration has released the most detailed analysis to date of the production of top-quark pairs alongside a W boson.
Physics Briefing | 24 Mar 2023
ATLAS measures the strength of the strong force
The ATLAS Collaboration at CERN has released a precise new measurement of the Z-boson transverse momentum. This has allowed researchers to determine the strength of the strong force. Their result has less than 1% uncertainty, making it the most precise determination of the strong force ever made by a single experiment.
Physics Briefing | 23 Mar 2023
Searching from top to bottom for lepton unity
The ATLAS Collaboration has released an impressive set of searches for leptoquarks interacting with third-generation leptons or quarks – placing valuable constraints on leptoquark parameters.
Physics Briefing | 22 Mar 2023
Tau & co.: the search for new physics with the heaviest leptons
The ATLAS Collaboration has released two new studies of the tau lepton, investigating whether this elementary particle may actually be composite in nature.
Physics Briefing | 21 Mar 2023
Summary of new ATLAS results from 2023 Winter Conferences
The winter conference season has begun! This month, all roads lead to La Thuile in the Italian Alps, where experimental physicists and theorists will take part in some of the most important particle physics meetings of the year. The La Thuile and Rencontres de Moriond conferences promise not to disappoint, with topical sessions ranging from heavy-ion and neutrino physics, to dark matter searches and astroparticle observations.
News | 16 Mar 2023
In conversation with Kevin Einsweiler, an instrumental voice in ATLAS upgrades
Kevin Einsweiler is a senior scientist at Lawrence Berkeley National Lab (LBNL). He joined the ATLAS Collaboration in 1993, playing an instrumental role in bringing US institutes into the LHC programme. He served as ATLAS Pixel Project Leader (2005-2009), Physics Coordinator (2011-2013) and Upgrade Coordinator (2014-2019).
Portrait | 06 Mar 2023
ATLAS management begins new term
The ATLAS Collaboration at CERN welcomes a new management team at its helm. Spokesperson Andreas Hoecker (CERN) will continue to steer the experiment until March 2025.
News | 06 Mar 2023
Winners of the 2022 ATLAS Thesis Awards announced
Behind nearly every great ATLAS result lies an outstanding PhD student! Students are a key cohort of the ATLAS Collaboration, making critical contributions to the experiment while working on their degree. Every year, the Collaboration comes together to celebrate their work in the context of the ATLAS Thesis Awards.
News | 20 Feb 2023
ATLAS delivers most precise luminosity measurement at LHC
The ATLAS Collaboration has just released its most precise luminosity measurement to date. They studied four years of measurements (2015-2018), covering the entire Run 2 of the LHC to assess the amount of luminosity delivered to the ATLAS experiment.
Experiment Briefing | 24 Jan 2023
A new ATLAS for the high-luminosity era
Stefan Guindon, Christian Ohm and Caterina Vernieri describe the major ‘Phase II’ upgrades taking place to prepare the ATLAS detector for the High-Luminosity LHC.
Feature | 18 Jan 2023
ATLAS casts wide net in search for new high-mass particles
The ATLAS Collaboration has performed an extensive search for new, high-mass particles that can decay to a pair of W bosons. As many theoretical models predict the existence of such high-mass particles, physicists were able to investigate the validity of several models at once across a large energy range.
Physics Briefing | 01 Dec 2022
ATLAS moves into top gear for Run 3
The ATLAS Collaboration has just released its first Run 3 measurements, studying data collected in the first half of August 2022. Researchers have measured the interaction strength (or cross-section) of two well-known processes: the production of a pair of top quarks and the production of a Z boson.
Physics Briefing | 30 Nov 2022
ATLAS measures Higgs width
In a highlight result presented at the Higgs 2022 conference, the ATLAS Collaboration studied the production of off-shell Higgs bosons with a high invariant mass decaying into two on-shell Z bosons using the data collected during LHC Run 2 (2015-2018). For their new search, ATLAS physicists focused on events where the two Z bosons decay into four charged leptons (ZZ→4l channel) or two charged leptons plus two neutrinos (ZZ→ 2l2v channel), as they offered the highest signal sensitivity.
Physics Briefing | 15 Nov 2022
ATLAS and Seal Storage Technology collaborate on new archival storage
The ATLAS Collaboration has partnered with Seal Storage Technology in a pilot project to explore their decentralised cloud storage platform as an efficient and cost-effective option for archival data storage
News | 28 Oct 2022
ATLAS celebrates 30 years of collaboration
The ATLAS Collaboration celebrated its 30th anniversary on 1 October 2022.
News | 01 Oct 2022
ATLAS Live talk: Searching for new, long-lived particles at the LHC with Dr. Hideyuki Oide
On 6 October at 2pm CET, Dr. Hideyuki Oide will give a live public talk on the ATLAS Youtube Channel on the LHC's search for new, long-lived particles.
News | 27 Sep 2022
Using the Higgs boson to search for dark photons
The ATLAS Collaboration has been looking for signs of dark photons in data collected by the experiment during LHC Run 2 (2015-2018). Their newest search targets, for the first time in ATLAS, the production of a Higgs boson in association with a Z boson, with subsequent decay of the Higgs into a photon and a dark photon.
Physics Briefing | 15 Sep 2022
ATLAS Highlights from ICHEP 2022
At ICHEP 2022, the ATLAS Collaboration presented the results of 30 new studies, spanning from Higgs boson and Standard Model measurements to searches for new phenomena.
News | 22 Jul 2022
ATLAS observes potential four-charm tetraquark
In a new analysis presented at the ICHEP 2022 conference, ATLAS physicists found evidence of a four-charm-quark excess. Like the LHCb Collaboration, ATLAS sees both the X(6900) particle and a broad structure at threshold.
Physics Briefing | 09 Jul 2022
ATLAS measures quantum interference when protons bounce off each other
In a new result presented at ICHEP 2022, ATLAS physicists set out to measure proton scattering at microradian angles and study this quantum interference.
Physics Briefing | 08 Jul 2022
ATLAS measures joint polarisation of W and Z bosons
In a new result presented at the ICHEP 2022 conference, ATLAS physicists have been able to observe events with both a W and Z boson simultaneously polarised longitudinally for the very first time.
Physics Briefing | 07 Jul 2022
Summary of new ATLAS results from ICHEP 2022
The 2022 International Conference on High Energy Physics (ICHEP) kicks off this week in Bologna, Italy. The ATLAS Collaboration will be unveiling a wide range of new results, exploring the full potential of the dataset collected during LHC Run 2 (2015-2018).
News | 06 Jul 2022
ATLAS Experiment records “first physics” at new high-energy frontier
“We have proton collisions in the ATLAS experiment.” At 16.47 CEST, the Large Hadron Collider (LHC) officially kicked off its third period of operation (Run 3). The LHC is colliding proton beams at a world-record-breaking energy of 13.6 tera electron volts (TeV). The higher beam energy and intensity of Run 3 will allow the ATLAS experiment to push the very limits of its physics research.
Press Statement | 05 Jul 2022
LHC Run 3 starts
The Large Hadron Collider is ready to once again start delivering proton collisions to experiments, this time at an unprecedented energy of 13.6 TeV, marking the start of the accelerator’s third run of data taking for physics.
Press Statement | 04 Jul 2022
ATLAS explores the self-interaction of the Higgs boson
In the most recent effort to constrain the Higgs self-coupling constant, ATLAS physicists used the full Run 2 dataset (collected during 2015-2018) to perform a combined study on the production of a single Higgs boson and two Higgs bosons. This single-Higgs analysis was featured in a paper released in Nature today, looking back on 10 years of Higgs boson research at the ATLAS Experiment
Physics Briefing | 04 Jul 2022