Heavy, energetic and fast-decaying — the #topquark’s properties make it an incredible tool for searching for new particles at high energy. Using an ingenious new technique, ATLAS physicists at @cern.bsky.social are now exploring single-top collisions with high precision ⤵️ atlas.cern/Updates/Brie...

Happy #PrideinSTEMDay! 🏳️‍🌈🏳️‍⚧️ ATLAS proudly celebrates the incredible diversity of our scientific community. Our varied backgrounds, perspectives and identities drive excellence in research. We are committed to advancing the recognition and representation of our LGBTQ+ colleagues — today and every day.

Heavy-ion season is here! 💥⁠ ⁠ The ATLAS Experiment at @cern.bsky.social has recorded its first lead-lead collisions of 2025, marking the start of three weeks of heavy-ion running at 5.36 TeV per nucleon pair.⁠ Take a look at some of our first spectacular event displays!⁠

🎤 Are you passionate about science? Show us! 😉 To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.

Curiosity drives discovery!🌌 The ATLAS Experiment @cern.bsky.social brings together thousands of scientists and engineers from around the world to explore the building blocks of the Universe. 🎥 Watch our new introductory video, available in 6 languages on YouTube. www.youtube.com/watch?v=6UqW...

A rare sight at the LHC 👀 The ATLAS Collaboration at @cern.bsky.social reports its first observation of WWγ production — a rare process where two W bosons and a photon are produced together. 🔗 Learn more: atlas.cern/Updates/Brie...

Congratulations to ATLAS Physicist Mounia Laassiri (Brookhaven National Laboratory) on being named a laureate of the 2025 UNESCO–AI Fozan Prize for the Promotion of Young Scientists in STEM! 🔗 Learn more: www.unesco.org/en/articles/...

Four charm quarks, one exotic state: the X(6900) tetraquark. The ATLAS Collaboration at @cern.bsky.social takes a deep dive into the all-charm tetraquark, marking a key step toward understanding exotic bound states of quarks. Learn more ⤵️ atlas.cern/Updates/Brie...

What if we could turn the LHC into a lepton–proton collider? ✨ Thanks to rare quantum fluctuations, protons can briefly contain lepton–antilepton pairs. This allows ATLAS physicists to study lepton–proton collisions, opening a new door in the search for leptoquarks! ⤵️ atlas.cern/Updates/Brie...

Neon collides at the LHC! ✨ The ATLAS Experiment at @cern.bsky.social records its first-ever neon–neon collisions. Take a look at these striking collision event displays – then discover how neon opens up exciting new opportunities to explore the strong force! 🔗 atlas.cern/Updates/News...

Modern #AI techniques are unlocking new ways to analyse particle collisions – and ATLAS is embracing the possibilities. 🔗 Check out our new briefing to learn more ⤵️ atlas.cern/Updates/Brie...

ATLAS closes in on two rare Higgs boson decays! 🤔🔎 New results based on 7 years of LHC data reveal evidence for the Higgs boson decaying to muons, and significantly enhance sensitivity to its decay into a Z boson and a photon. 🔗 Learn more ⤵️ atlas.cern/Updates/Brie...

Elusive romance of top-quark pairs observed at the LHC The @cmsexperiment.bsky.social and @atlasexperiment.bsky.social at CERN’s Large Hadron Collider have observed an unforeseen feature in the behaviour of top quarks that suggests that they form a fleeting union

Bound to be discovered? 🌌 Physicists at the ATLAS Experiment at @cern.bsky.social have observed a "quasi-bound" state formed by a top quark and an anti-top quark – an interaction so subtle it was long thought undetectable at the #LHC. 🔗 Learn more ⤵️ atlas.cern/Updates/Brie...

ATLAS records its first-ever oxygen-oxygen collisions at the LHC! 🎇 These collisions offer a new way to explore the quark-gluon plasma in smaller systems — bridging the gap between proton-lead and lead-lead collisions. 🔗 Learn more: atlas.cern/Updates/News...

13 years later… still a picture-perfect moment!📸 On 4 July 2012, ATLAS and @cmsexperiment.bsky.social announced the discovery of the Higgs boson! Today, we return to the places that witnessed history, because some stories are worth reliving. The Higgs journey since 2012 👉️ atlas.cern/Discover/Phy...

The ATLAS Collaboration at @cern.bsky.social has just launched a new release of #opendata designed to empower education, outreach and #citizenscience! Explore the new release ⤵️ opendata.atlas.cern/docs/categor...

Protons and oxygen collide!💥 The ATLAS Experiment at @cern.bsky.social has recorded its first-ever proton–oxygen collisions. Breathe in today's stunning event displays, then learn how these light-ion collisions can deepen our understanding of fundamental forces. ➡️ atlas.cern/Updates/News...

The ATLAS Collaboration proudly celebrates the recipients of the 2025 ATLAS Outstanding Achievement Awards – recognising the essential, behind-the-scenes work that powers great physics. Meet this recipients ⤵️ atlas.cern/Updates/News...

🎓 Studying particle physics? We've got you covered with expert-designed #cheatsheets from the ATLAS Collaboration! From Feynman diagrams to Monte Carlo, these resources break down some of the most important concepts in particle physics. 🔗 Explore them all here: atlas.cern/Resources/Ch...

🎉 Congratulations to ATLAS Physicist Maria Teresa Dova (University of La Plata) on being named a laureate of the 2025 L’Oréal-UNESCO For Women in Science Awards! 🔗 Learn more: www.unesco.org/en/articles/...

Congratulations to ATLAS physicist Daniela Bortoletto of @ox.ac.uk on being named a 2024 Emmy Noether Distinction Laureate by the European Physical Society! 🎉 🔗 Learn more: eps.org/the-eps-emmy-noether-distinction-2024-is-announced

Here we see the @atlasexperiment.bsky.social Inner Tracker (ITk) Pixel Module assembly #AtCERN. The ITk is a completely new, state-of-the-art detector that will replace the current innermost layer of ATLAS.

The ATLAS Experiment at @cern.bsky.social has just set record limits on #Higgsboson self-interaction. The new result is the first to combine the LHC Run 2 and Run 3 datasets, using an incredible 300 fb⁻¹ of proton–proton collision data. 😳 Learn more ⤵️ atlas.cern/Updates/Brie...

Since the Higgs boson’s discovery, physicists have been refining their understanding of its behavior. ATLAS has released 3 new studies of Higgs decays to W/Z boson pairs, probing its total width – a fundamental parameter – and searching for new physics. Learn more ⤵️ atlas.cern/Updates/Brie...

Researchers at the ATLAS Experiment are searching for a hidden “dark sector” - a realm of new particles and forces that interact very weakly with known matter. Two new results target distinctive signatures of dark-sector particles. atlas.cern/Updates/Brie...

🚀 And we're off! On 5 May 2025, the ATLAS Experiment recorded its first 13.6 TeV collisions of the year, kicking off the third of Run 3 at @cern.bsky.social's flagship accelerator. These event displays capture the first moments of a promising new data-taking season. Learn more: cern.ch/run3-2025

‘Tis the season of #physics 💫 “Stable" particle beams returned to the Large Hadron Collider at 13.51 CEST today, marking the start of the 2025 physics data-taking season, the fourth of the #LHCRun3.

Exploring the W boson at extreme mass scales!🤔 Since their discovery in the 1980s, W bosons have played a key role in exploring the electroweak sector of the Standard Model — and in searching for what might lie beyond it. Learn more about the new ATLAS study ⤵️ atlas.cern/Updates/Brie...

New ATLAS events just dropped! 🎇 Proton beams from the #LHC lit up the ATLAS experiment at #CERN today — and we’ve got the event displays to prove it. ⁠These dazzling "beam splashes" help us test and align our sub-detectors, setting the stage for data-taking.

Physicists from the ATLAS Experiment have released a host of new studies of #heavyion collisions – helping to unravel how matter behaved in the early Universe. Check out the highlights ⤵️ atlas.cern/Updates/News...

ATLAS gets under the hood of the #Higgs mechanism. The detection of longitudinally polarised W boson production at the #LHC is an important step towards understanding how the primordial electroweak symmetry broke, giving rise to the masses of elementary particles. More↓ atlas.cern/Updates/Pres...

“This prize is a celebration of our collaboration, curiosity, and dedication. Thank you to the Breakthrough Prize Board for this incredible honor. And thank you to every ATLAS member—this achievement is yours.” – Stephane Willocq, ATLAS Spokesperson Learn more: atlas.cern/Updates/Pres...

The ATLAS Collaboration has been awarded the 2025 Breakthrough Prize in Fundamental Physics, along with the ALICE Experiment, @cmsexperiment.bsky.social and @lhcb.bsky.social. atlas.cern/Updates/Pres...

Physicists at the ATLAS Experiment @CERN have reported the first evidence of vector boson scattering involving longitudinally polarized same-sign W bosons. This remarkable result provides a powerful probe of the Higgs mechanism. Learn more⤵️ atlas.cern/Updates/Brie...

What if new physics is hiding just out of sight? ✨ New particles created by the #LHC could travel several meters before decaying inside the ATLAS experiment – leaving behind “displaced” tracks. Learn more ⤵️ atlas.cern/Updates/Brie...

The Higgs boson interacts much more strongly with tau leptons than with electrons or muons — but why? The ATLAS Collaboration at #CERN has just released two new studies investigating the production of taus in high-energy proton collisions. Find out more⤵️ atlas.cern/Updates/Brie...

The ATLAS Collaboration has just presented its most precise single measurement of the top quark mass, using high-momentum ("boosted") top quarks! 🔗 Learn more in the new briefing atlas.cern/Updates/Brie...

Tune in today at 11 AM CET for a live LHC Seminar on new measurements of the top quark! ATLAS physicist Mark Owens will present a new study that has boosted the precision of the top quark mass measurement. Watch live: cern.ch/atlas-webinar

🇬🇷 Συντονιστείτε για μια ζωντανή εικονική επίσκεψη στο πείραμα ATLAS στο CERN με τη Δέσποινα Σαμψωνίδου και τον Κάρολο Ποταμιάνο. Σήμερα στις 16:00 (ώρα Ελλάδας) ζωντανά στο YouTube: www.youtube.com/watch?v=ivWp...

Ζωντανή Διαδικτυακή Ξενάγηση στο πείραμα ATLAS στο CERN ! Συνδεθείτε μαζί μας και δείτε από μέσα το πείραμα ATLAS μαζί με τους φυσικούς Δέσπονα Σαμψωνίδου και Κάρολο Ποταμιάνο – στα Ελληνικά 🇬🇷 📅 Ημερομηνία: 20 Μαρτίου 🕒 Ώρα: 15:00 (CET) 📺 Πού: Ζωντανά στο YouTube www.youtube.com/watch?v=ivWp...

The ATLAS Collaboration at CERN welcomes a new management team, with Stéphane Willocq (University of Massachusetts Amherst) as Spokesperson. He takes the helm at a pivotal moment for ATLAS, as members wrap up data-taking from #LHC Run-3 and prepare for extensive upgrades. atlas.cern/Updates/News...

This International Women’s Day, 8 March, we challenged 8 brilliant women from ATLAS to tell us about each other — with no scripts, just physics! Join us in celebrating the diversity, talent and dedication of the women who help drive our Collaboration forward every day: shorturl.at/OvlIH

🏆 And the ATLAS Thesis Awards go to… 👏 Congratulations to the winners: Christian Appelt, Ana Luisa Moreira de Carvalho, Shalini Epari, Emily Ann Smith, Kaito Sugizaki, Martino Tanasini, Aric Tate, and Makayla Vessella! Learn more & check out their winning theses ⤵️ atlas.cern/updates/news...

¡Únete a Rebeca Gonzalez Suarez (🇪🇸) y a Dilia Portillo Quintero (🇨🇴) en este tour virtual en directo desde el experimento ATLAS en el CERN! Hoy a las 17:00 (CET) en YouTube: www.youtube.com/watch?v=8Lgg...

¡Únete a nosotros en un recorrido virtual en directo desde el detector ATLAS en el #CERN! Participa en esta emocionante visita entre bastidores con dos miembros de ATLAS – en español. 🗓️ Fecha: 25 de febrero ⏰ Hora: 17:00 (CET) 📺 Dónde: En directo en YouTube www.youtube.com/watch?v=8Lgg...

To celebrate #IDWGS, we are heading underground with Dr. Neza Ribaric and Dr. Claudia Merlassino to see the ATLAS Experiment at CERN! Join the live virtual visit on Tiktok: www.tiktok.com/@atlasexperi...

Today, on the International Day of Women and Girls in Science, we celebrate the incredible contributions of women in the ATLAS Collaboration at @CERN. ATLAS is committed to fostering an inclusive environment where talent thrives regardless of gender. #IDWGS

Junte-se a nós nesta tour virtual em direto da Experiência ATLAS no CERN. 🇵🇹 🇧🇷 Está prestes a começar! www.youtube.com/watch?v=Xoc6...

Junte-se a nós numa tour virtual em direto da Experiência ATLAS no #CERN! Participe nesta emocionante visita pelos bastidores com dois membros do ATLAS – em português 🇵🇹 🗓️ Data: 6 de fevereiro ⏰ Hora: 17:00 (CET) 📺 Onde: Em direto no YouTube www.youtube.com/live/Xoc6bM8...