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ATLAS Experiment @atlasexperiment.bsky.social · 21h

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...

Shining light on the Weak force: ATLAS observes WWγ production

The ATLAS Collaboration reports its first observation of WWγ production – a rare process involving the simultaneous production of two W bosons and a photon. The weak force is one of the four fundament...

atlas.cern

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ATLAS Experiment @atlasexperiment.bsky.social · 16d

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/...

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ATLAS Experiment @atlasexperiment.bsky.social · 20d

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...

ATLAS takes a closer look at the all-charm tetraquark

The strong force, unrivaled in strength yet confined to minuscule distances, produces unique bound states of quarks known as quarkonia. These are the strong-force equivalent of the hydrogen atom, cons...

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ATLAS Experiment @atlasexperiment.bsky.social · Aug 28

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...

Turning the LHC into a Lepton-Proton Collider in the search for leptoquarks

All matter in the universe is made up of just two fundamental building blocks: quarks and leptons. Intriguingly, both have three distinct families or “generations”. For example, the electron and its a...

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 10

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...

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 10

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...

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 8

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...

ATLAS closes in on rare Higgs decays

The ATLAS Collaboration finds evidence of Higgs-boson decays to muons and improves sensitivity to Higgs-boson decays to a Z boson and a photon. Since the discovery of the Higgs boson in 2012, physicis...

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Reposted by ATLAS Experiment

CERN @cern.bsky.social · Jul 8

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

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 7

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...

Bound to be discovered? ATLAS explores top-quark interactions near threshold

The top quark is a bit of a loner. While other quarks can join together to form bound states called hadrons, the top quark’s extremely short lifetime means it decays almost instantly – disappearing be...

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 7

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...

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 4

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...

1️⃣ François Englert and Peter Higgs at the announcement

2️⃣ They weren’t alone — the auditorium was packed

4️⃣ Journalists waiting for the press conference

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 3

This release simplifies and expands on previous ATLAS open data releases with a dedicated, open-source framework, now publicly available, alongside enhanced tools and documentation. It includes:
🗒️ Guided workbooks and code
💻️ Modules to build computing skills
🧑‍🏫 Support for educators

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 3

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...

13 TeV (2025 Beta Release) | ATLAS Open Data

Welcome to the tutorial page for the 2025 13 TeV beta release. Please, start by choosing your enviroment and continue as needed.

opendata.atlas.cern

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ATLAS Experiment @atlasexperiment.bsky.social · Jul 1

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...

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ATLAS Experiment @atlasexperiment.bsky.social · Jun 30

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...

Celebrating the outstanding achievements of the ATLAS Collaboration

The ATLAS Collaboration celebrated the dedication, ingenuity and collaborative spirit of its members at the 8th Outstanding Achievement Awards. Winners of the ATLAS Outstanding Achievement Awards 2025...

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ATLAS Experiment @atlasexperiment.bsky.social · Jun 5

🎓 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...

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ATLAS Experiment @atlasexperiment.bsky.social · Jun 4

🎉 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/...

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ATLAS Experiment @atlasexperiment.bsky.social · Jun 3

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

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Reposted by ATLAS Experiment

CERN @cern.bsky.social · Apr 22

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.

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ATLAS Experiment @atlasexperiment.bsky.social · May 22

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...

ATLAS sets record limits on Higgs self-interaction using Run 3 data

One of the biggest open questions in particle physics today is how the Higgs boson interacts with itself. This “self-coupling” plays a pivotal role in determining the shape of the energy potential of ...

atlas.cern

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ATLAS Experiment @atlasexperiment.bsky.social · May 16

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...

Studying the Higgs boson across the scales

Since the Higgs boson's discovery in 2012, physicists have continued to explore its properties with increasing precision, revealing the inner workings of the Standard Model and probing for hints of ph...

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ATLAS Experiment @atlasexperiment.bsky.social · May 15

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...

Shedding light with jets from the dark side

Imagine a jet of particles that defies the rules of the Standard Model. Unlike most jets produced in high-energy collisions, its energy seems to suddenly vanish or it doesn't originate at the collisio...

atlas.cern

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ATLAS Experiment @atlasexperiment.bsky.social · May 6

🚀 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

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Reposted by ATLAS Experiment

CERN @cern.bsky.social · May 5

‘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.

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ATLAS Experiment @atlasexperiment.bsky.social · Apr 15

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...

Exploring the W boson at extreme mass scales

Since their discovery in the 1980s, W bosons have been extensively studied by physicists. As carriers of the weak force, precise measurements of their properties help improve the understanding of the ...

atlas.cern

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