ATLAS

First analysis of Run 3 data with a new slim data format

The ATLAS Collaboration has just released a new measurement of the production cross-section of two Z bosons. This highlight result examines data collected during Run 3 of the LHC – with protons colliding at a record energy of 13.6 TeV – and pioneers…

DIRAC and Rucio Workshops 2023

DIRAC and Rucio are two software projects used for scientific computing. Both projects are led by CERN, and the EP department is one of the major contributors to both. DIRAC is used by CERN experiments such as LHCb, CLIC, FCC, NA62, and non-CERN…

ATLAS and CMS unite to weigh in on the top quark

The ATLAS and CMS Experiments at CERN have just released a new measurement of the mass of the top quark. The new result combines 15 previous measurements to give the most precise determination of the top-quark mass to date. Among the known…

Ending the 2023 LHC run with heavy-ion collisions

The LHC schedule for 2023 has been revised following the emergence of a leak in mid-July. The decision was to stop the regular proton running this year and focus on the heavy ion physics that was already scheduled for the year-end. This was…

The ATLAS New Small Wheel - Triggering on muons and rejecting fakes

The New Small Wheel (NSW) [1] has been the largest Phase-1 upgrade project of ATLAS. The two innermost stations of the Endcap Muon spectrometer have been replaced with two newly built detector systems based on small-strip Thin Gap Chambers (sTGC)…

Interview with Valentina Cairo

Earlier this summer, the 2023 Young Experimental Physicist Prize of the High Energy and Particle Physics Division of the European Physical Society – for early career experimental physicists – was awarded to CERN staff physicist Valentina Cairo for…

Triggering in ATLAS in Run 3

The ATLAS collaboration recently celebrated its 30th anniversary following the submission of the experiment’s Letter of Intent in 1992 and has accomplished great achievements during these years. However, it is still a young experiment, with only 6%…

Jet Substructure as a powerful probe of Quantum Chromodynamics

Jet substructure (JSS) has emerged as a powerful framework for studying the Standard Model (SM) and provides a key set of tools for probing nature at the highest energy scales accessible by terrestrial experiments. While not an experimental or…

ATLAS gears up for Run 3 physics results

Who breaks Electroweak symmetry? It sounds like a simple question and the Standard Model of Particle Physics, the prevailing theory for the last half century, has a simple answer - it’s the Higgs. The Standard Model theory predicts that the Higgs…

New ATLAS result weighs in on the W boson

For the past 40 years, the W boson has been making headlines. In the 1980s, the announcement of its discovery helped confirm the theory of the electroweak interaction – a unified description of electromagnetic and weak forces. Today, measurements of…

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