CERN Open Data2026 · Event data · ROOT
ATLAS proANUBIS calibration data set<p>The ANUBIS prototype 'proANUBIS' collected data on the scaffolding of the A side of the ATLAS cavern during 2024 and 2025 pp data-taking. To assist with calibrating and measuring the performance of the proANUBIS tracking and timing for particles visible in both ATLAS and proANUBIS, this ATLAS open dataset contains events with muons or jets that have trajectories consistent with reaching proANUB
CERN Open Data2026 · dataset
ATLAS 13TeV ttbar LHE data set<p>This dataset includes top quark pair production events generated at next to leading order in the strong coupling constant. Each file contains 16,500 matrix-element events in LHE format, along with 193 event weights including modified scales and PDF settings. The files are tarball archives, each containing a single gzipped file with events. The detailed settings used in event generation are stor
CERN Open Data2026 · Table ·
ATLAS OmniFold Full Charged Particle Phase Space Open DataThis dataset is the full phase space measurement of Z(mu mu)+jets production at sqrt(s)=13 TeV performed by the ATLAS Collaboration, unfolded with the OmniFold machine-learning unfolding algorithm. Because the measurement is unbinned, results are provided as a dataset of particle level events simulated with Monte Carlo methods, with per-event weights provided by OmniFold. Applying the weights to t
CERN Open Data2026 · dataset
ATLAS multi-process simulation for ML-based jet flavour tagging (JetSet2)<p>Flavour tagging, the identification of jets originating from bottom and charm quarks and from hadronically decaying tau leptons, is essential for many physics analyses at the ATLAS experiment. This dataset, released for public use, can be used to train and evaluate machine learning models for jet flavour tagging. It is the second ATLAS flavour-tagging open dataset (JetSet2), the successor to th
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 2to4lep skimMC simulation, 2015+2016 proton-proton collisions beta release, 2to4lep skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ROOT ntuple format 2015-2016 proton-proton Open Data for Education and Outreach beta release from the ATLAS experimentRun 2 2015+2016 proton-proton collision data and corresponding MC simulation Open Data for Education and Outreach from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 2J2LMET30 skimRun 2 2015+2016 proton-proton collision data beta release, 2J2LMET30 skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 2J2LMET30 skimMC simulation, 2015+2016 proton-proton collisions beta release, 2J2LMET30 skim from the ATLAS experiment
CERN Open Data2025 · dataset
ATLAS HEPMC format Specialised SM Z-boson 13 TeVSpecialised SM Z-boson samples at sqrt(s)=13 TeV from the ATLAS experiment. This record collects related samples. Some care is required when combining samples in order to ensure a complete physics representation without overlaps or omissions; please read the documentation of the open data, linked below, carefully.
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 2to4lep skimRun 2 2015+2016 proton-proton collision data beta release, 2to4lep skim from the ATLAS experiment
CERN Open Data2025 · Array · HDF5
Photon showers in the ATLAS fast calorimeter simulation: A voxelized dataset with minimized information loss and improved ML models<p> For the upcoming high luminosity runs at ATLAS, it is necessary to replace the full calorimeter simulation with the fast calorimeter simulation in almost all cases. The current ATLAS fast calorimeter simulation, AtlFast3, uses parametric approaches to speed up the computing time significantly. Even though AtlFast3 generally achieves a high degree of accuracy, further quality improvements withi
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 2muons skimMC simulation, 2015+2016 proton-proton collisions beta release, 2muons skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, exactly4lep skimRun 2 2015+2016 proton-proton collision data beta release, exactly4lep skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 3lep skimRun 2 2015+2016 proton-proton collision data beta release, 3lep skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 2bjets skimMC simulation, 2015+2016 proton-proton collisions beta release, 2bjets skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, exactly3lep skimMC simulation, 2015+2016 proton-proton collisions beta release, exactly3lep skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 3J1LMET30 skimRun 2 2015+2016 proton-proton collision data beta release, 3J1LMET30 skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, no skimMC simulation, 2015+2016 proton-proton collisions beta release, no skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 2muons skimRun 2 2015+2016 proton-proton collision data beta release, 2muons skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 1LMET30 skimMC simulation, 2015+2016 proton-proton collisions beta release, 1LMET30 skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 4lep skimMC simulation, 2015+2016 proton-proton collisions beta release, 4lep skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 2bjets skimRun 2 2015+2016 proton-proton collision data beta release, 2bjets skim from the ATLAS experiment
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format MC simulation, 2015+2016 proton-proton collisions beta release, 3J1LMET30 skimMC simulation, 2015+2016 proton-proton collisions beta release, 3J1LMET30 skim from the ATLAS experiment
CERN Open Data2025 · dataset
HEPMC format 13 TeV proton-proton Open Data from the ATLAS experiment<p>HEPMC format 13 TeV proton-proton Open Data from the ATLAS experiment.</p><p>This summary record is provided as a single point of entry and single record to cite for the HEPMC open data.</p><p>As additional datasets are added to the open data, this record will be extended.<p></p><i>Created on June 10th 2025. The record currently only contains the first set of samples. This is to allow time for
CERN Open Data2025 · Event data · ROOT
ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, no skimRun 2 2015+2016 proton-proton collision data beta release, no skim from the ATLAS experiment