The Last Quark
Twenty-five years on from the discovery of the top quark, ATLAS physicist Richard Hawkings discusses the history of the particle's discovery, its place in the Standard Model and what it has still yet to tell us.
Feature | 23 Jul 2021
Shining light on the strong interaction: ATLAS measures photon pair production
What can particles of light – photons – tell us about the inner workings of the Standard Model? A new paper from the ATLAS Collaboration measures pairs of photons to improve the understanding of a fundamental force of Nature – the strong force – and thus scrutinise the theoretical models that underpin high-energy physics research.
Physics Briefing | 22 Jul 2021
Live from the ATLAS experiment
In celebration of the lowering of the first New Small Wheel detector, CERN is hosting a 360° live event from the ATLAS cavern! Tune in on Thursday 15 July at 5pm CEST.
News | 14 Jul 2021
Studying “Little Bangs”: exotic collisions probe the size of quark-gluon plasma
A new result from the ATLAS Collaboration studies the interactions of photons – particles of light – with lead nuclei at the Large Hadron Collider (LHC). Using new data collection techniques, physicists revealed an unexpected similarity to the experimental signatures of the quark–gluon plasma.
Physics Briefing | 13 Jul 2021
ATLAS Live talk: Deciphering the Higgs boson with Dr Hongtao Yang
On 1 July 2021, Dr. Hongtao Yang will be giving a live public talk, sharing the story of the Higgs boson's discovery by the ATLAS and CMS experiments. He will explain what ATLAS physicists have learned about this fascinating particle so far, and describe the next steps in its exploration.
News | 29 Jun 2021
ATLAS celebrates results of 1000 collision papers
The ATLAS Collaboration celebrates the creativity, wealth and scientific impact enshrined in its 1000 papers using LHC collision data. This work – together with that carried out by its sister experiments at the LHC – represents a diversified physics programme that is unprecedented and unequalled in physics research to date.
News | 18 Jun 2021
The hunt for higgsinos reaches new limits
The ATLAS Collaboration has released three new searches for "higgsinos" - the super-partner of the Higgs boson.
Physics Briefing | 10 Jun 2021
Heavyweight champions: a search for new heavy W’ bosons with the ATLAS detector
A new search from the ATLAS Collaboration, released this week at the Large Hadron Collider Physics conference (LHCP 2021), sets limits on the mass of the W’ boson.
Physics Briefing | 09 Jun 2021
ATLAS measures the polarisation of top quarks and antiquarks
In a new result presented by the ATLAS Collaboration, physicists have measured – for the first time – the full polarisation vectors for both top quarks and antiquarks.
Physics Briefing | 08 Jun 2021
New search for charming decay of the Higgs boson
At the LHCP2021 conference, the ATLAS Collaboration presents a new direct search for the decay of the Higgs boson to charm quarks. Observing this decay would give physicists new insight into the Higgs boson’s relationship with the second generation of matter particles.
Physics Briefing | 07 Jun 2021
Summary of new ATLAS results from LHCP 2021
The ninth annual conference on Large Hadron Collider physics (LHCP 2021) begins today in video-conference rooms around the world.
News | 07 Jun 2021
ATLAS Live talk: How to study matter at a trillion degrees with Dr. Anne Sickles
Soon after the Big Bang, the Universe was too hot for normal matter to exist. Instead, it was made up of an extremely hot liquid of quarks and gluons: the quark-gluon plasma (QGP). In this live talk, Dr. Anne Marie Sickles explains how physicists at the ATLAS experiment are studying the QGP and what they've have learned.
News | 05 Jun 2021
First ATLAS New Small Wheel nears completion
On Friday 28 May 2021, teams of physicists and engineers installed the final "wedge" of the first ATLAS New Small Wheel detector. This was an important milestone for the Collaboration, in preparation for the wheel’s installation in the ATLAS cavern later this summer.
News | 04 Jun 2021
ATLAS Live talk: From Data to Discovery with Dr. James Catmore
Making a scientific breakthrough in 2021 requires more than just a microscope – most scientists rely on powerful computers and ingenious software to carry out their research. In this live talk, Dr. James Catmore explains the advanced computing and software techniques used by the ATLAS Experiment.
News | 10 May 2021
Supporting talented students with the ATLAS PhD Grant
On 13 April 2021, the recipients of this year's ATLAS PhD Grant were celebrated in an online ceremony. These talented and motivated students will receive 1.5 years of funding for their studies at CERN, giving them the opportunity to enhance their doctoral studies in a one-of-a-kind research environment.
News | 04 May 2021
In conversation with John Rutherfoord, a leading designer of the ATLAS Calorimeter
John P. Rutherfoord is a professor at the University of Arizona and a long-standing member of the ATLAS Collaboration. His extensive career has taken him from searching for the Upsilon particle at Fermilab to CERN to leading the design and development of the ATLAS Forward Calorimeter.
Portrait | 22 Apr 2021
Building community in virtual events
Since 2017, the ATLAS Early Career Scientist Board (ECSB) and Analysis Software Tutorial organisers have been teaming up to run a week-long introductory event for new ATLAS members. Induction Day welcomes new members to the collaboration by giving them an overview of the plethora of activities that take place within the ATLAS Collaboration.
Blog | 20 Apr 2021
ATLAS highlights from the Moriond 2021 conferences
The ATLAS Collaboration presented a host of brand-new results at Moriond spanning a broad range of subjects, from further tests of the Standard Model to searches for new phenomena motivated by as-yet unresolved mysteries of particle physics.
News | 02 Apr 2021
Twice the Higgs, twice the challenge
In the post-Higgs discovery era, scientists at the Large Hadron Collider (LHC) have been hard at work studying the Higgs boson’s properties. One property that remains to be experimentally verified is whether the Higgs boson can couple to itself (self-coupling).
Physics Briefing | 29 Mar 2021
ATLAS finds further confirmation of evidence for four top quark process
In a new result released this week, the ATLAS Collaboration studied the production of four top quarks at once in LHC collisions. This is the heaviest particle final state ever seen at the LHC, and provides physicists with a unique opportunity to study the top quark’s relationship to the Higgs boson.
Physics Briefing | 24 Mar 2021
Better late than never: ATLAS searches for late-decaying new particles
A new result from the ATLAS Collaboration – debuted at the virtual Moriond Electroweak conference – sets itself apart from more traditional LHC searches. Typically, physicists will look for new particles produced in LHC collisions that immediately decay to known or invisible particles. This analysis, in contrast, looks for new particles that live for roughly a hundred nanoseconds or more before decaying.
Physics Briefing | 23 Mar 2021
Deeper insight into Higgs boson production using W bosons
The Higgs boson reveals its properties to the outside world twice: during production and decay. ATLAS’ new result studies the Higgs boson at both of these moments, looking at its production via two different methods and its subsequent decay into two W bosons.
Physics Briefing | 22 Mar 2021
Summary of new ATLAS results from Moriond 2021
Since 1966, Les Rencontres de Moriond has united experimentalists and theorists for weeks of scientific discussion. 2021 is no exception – but instead of in-person chats over coffee in La Thuile (Italy), physicists will be sharing their new findings in online meetings.
News | 21 Mar 2021
The supersymmetric bottom quark and its friends
The special status of the top and bottom quarks makes them key players in the search for phenomena not foreseen by the Standard Model. New ATLAS results set strong constraints on the production of supersymmetric bottom quarks and of possible dark-matter particles.
Physics Briefing | 16 Mar 2021
Studying top quarks at high and not-so-high energies
CERN’s Large Hadron Collider (LHC) is famous for colliding protons at world-record energies – but sometimes it pays to dial down the energy and see what happens under less extreme conditions.
Physics Briefing | 11 Mar 2021