Breaking “R-parity” in new searches for supersymmetry
At the recent ICHEP 2024 conference held in Prague (Czech Republic), ATLAS physicists presented two innovative searches for R-parity-violating SUSY using data collected during the Run 2 of the LHC (2015 to 2018).
ATLAS releases precise new measurement of Higgs boson production in association with top quarks
At the recent International Conference on High-Energy Physics (ICHEP) 2024, the ATLAS Collaboration presented a new measurement of the ttH(bb) process using the same Run-2 dataset, achieving a factor of two better expected ttH signal significance compared to the previous result.
The beauty and the charm of the Higgs boson
The ATLAS Collaboration has just released the world’s most precise study of the Higgs boson’s interaction with bottom quarks and charm quarks. This new result is a re-analysis of data collected during Run 2 of the LHC (2015-2018). ATLAS researchers examined Higgs-boson decays to bottom and charm quarks (H→bb and H→cc) implementing significantly improved analysis techniques.
ATLAS probes uncharted territory with improved trigger
The ATLAS Collaboration has released its first search for new physics phenomena at the highest-ever collision energy of 13.6 TeV, targeting exotic events with two “displaced” leptons.
Hunting for magnetic monopoles with the Universe's strongest magnetic fields
In a new result from the ATLAS Collaboration, physicists analysed the first Run-3 heavy-ion collision data collected in the autumn of 2023. Specifically researchers looked at “ultraperipheral” collisions, where ions pass at a distance precluding hadronic interactions yet close enough to interact through electromagnetic fields.
Summary of new ATLAS results from ICHEP 2024
The 2024 International Conference on High Energy Physics (ICHEP) kicks off this week in Prague, Czech Republic. For over 70 years, ICHEP has gathered physicists from around the world to share the latest advancements in particle physics, astrophysics, cosmology, and accelerator science, and to discuss plans for major future facilities.
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ATLAS releases 65 TB of open data for research
The ATLAS Experiment at CERN has made two years’ worth of scientific data available to the public for research purposes. The data include recordings of proton–proton collisions from the Large Hadron Collider (LHC) at a collision energy of 13 TeV. This is the first time that ATLAS has released data on this scale, and it marks a significant milestone in terms of public access and utilisation of LHC data.
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ATLAS and CMS celebrate a decade of innovation by the RD53 Collaboration
On 24 June 2024, during an awards ceremony in CERN’s Main Auditorium, the ATLAS and CMS Collaborations paid special recognition to the RD53 Collaboration.
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Celebrating excellence at the 7th ATLAS Outstanding Achievement Awards
The ATLAS Collaboration held the 7th Outstanding Achievement Awards Ceremony on 20 June 2024. These biennial awards recognize the invaluable technical work performed across the Collaboration in various fields.
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Jetting into a new era of Higgs studies
The ATLAS Collaboration has made a significant advancement in the understanding of the Higgs boson by investigating its production in association with W or Z bosons (known as “VH production”), where the Higgs boson decays to bottom quarks. For the first time, LHC researchers have studied VH production in a fully hadronic final state.
ATLAS searches for the building blocks of dark matter
Researchers at the ATLAS Experiment release the first-ever direct search for new composite dark particles called dark mesons, presented this week at the Large Hadron Collider Physics (LHCP) Conference in Boston.
ATLAS dives deeper into di-Higgs: a combined search
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.
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Learning by machines, for machines: Artificial Intelligence in the world's largest particle detector
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.
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ATLAS chases long-lived particles with the Higgs boson
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.
Summary of new ATLAS results from LHCP 2024
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.
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Looking for the extended family of the Higgs boson
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.
Menu of the day: Di-Higgs soup!
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.
ATLAS explores Z boson production with heavy-flavour quarks
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.
ATLAS detects electrons and photons with greater clarity
New results released by the ATLAS Collaboration describe the significant advancements made in identifying electrons and photons.
ATLAS mourns the loss of Peter Higgs
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.
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ATLAS provides first measurement of the W-boson width at the LHC
In a groundbreaking new result, the ATLAS Collaboration has measured the W-boson width for the first time at the Large Hadron Collider (LHC).
First ATLAS measurement of W and Z boson production using Run-3 data
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.
Measuring the delicate balance of lepton flavours
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.
New ATLAS Results at Moriond24
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.
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ATLAS searches for new particles in familiar decays
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.
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