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"experiment": [
"ATLAS"
],
"featured": 1,
"featured": 2,
"short_description": {
"content": "The ATLAS Collaboration has released its first open data of heavy-ion collisions for research purposes. This dataset features lead-ion (Pb-Pb) collisions at an energy of 5 TeV per nucleon pair, recorded in 2015 as part of the Large Hadron Collider’s second operation period (LHC Run 2)."
},
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[
{
"author": "ATLAS Collaboration",
"body": {
"content": "atlas-open-data-for-education-outreach-release-2025-beta.md",
"format": "md"
},
"date_published": "2025-07-03",
"experiment": [
"ATLAS"
],
"featured": 1,
"short_description": {
"content": "The ATLAS Collaboration releases 25 datasets for education and outreach in a public 2025 \"beta\" release."
},
"slug": "atlas-open-data-for-education-outreach-release-2025-beta",
"title": "ATLAS releases 2025 beta open data for education and outreach",
"type": {
"primary": "News"
}
}
]
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**A major update for the 13 TeV ATLAS Education and Outreach Open Data**

The ATLAS Collaboration has just launched a new release of open data designed
to empower education, outreach and citizen science. Building on a commitment to
open access, the new 2025 Open Data for Education and Outreach (beta) release
offers a significant upgrade in usability, scale and technical support.

This release simplifies and expands on previous open data releases with a
dedicated, open-source framework, now publicly available, alongside enhanced
tools and documentation. It includes:

- Guided workbooks and code to help users analyse real LHC collision data
- Modules to build computing skills, perfect for students and independent
learners
- Support for educators to create custom courses and projects using real LHC
data

If you’ve used ATLAS Open Data before – this is also a big refresh. With
increased statistical power and updated tools, you can pursue all-new physics
analyses and revisit previous ones with enhanced precision.

So whether you’re a student, teacher, citizen scientist or just curious about
the Universe – dive into ATLAS Open Data for Education. Explore real LHC
collisions, develop valuable computing skills and uncover the properties of
fundamental particles for yourself.

The data are all available now on the [CERN Open Data Portal](/record/93910).
You can also [explore the documentation of the new
release](https://opendata.atlas.cern/docs/data/for_education/13TeV25_details)
or [visit the ATLAS Open Data Portal](https://opendata.atlas.cern) for more. We
will be building on this beta release with additional data selections,
analyses, and tools that will all be arriving soon!
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"experiment": [
"ATLAS"
],
"featured": 3,
"featured": 5,
"short_description": {
"content": "Explore over 75 billion LHC collision events — from home"
},
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"experiment": [
"DELPHI"
],
"featured": 2,
"featured": 4,
"short_description": {
"content": "The DELPHI Collaboration has released its data collection to the general public. Regardless of whether you are a researcher, teacher, student or just interested, start your journey through this exciting datasets from LEP."
},
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"format": "md"
},
"date_published": "2024-12-05",
"featured": 1,
"featured": 3,
"short_description": {
"content": "Today, the TOTEM Collaboration published the first data set on the CERN Open Data Portal. Data recorded by TOTEM is used to measure the total cross section and to study elastic scattering in proton-proton collisions at the LHC for different centre-of-mass energies."
},
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174 changes: 174 additions & 0 deletions data/records/atlas-odeo-FEB2025-1lmet30-data.json
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[
{
"abstract": {
"description": "Run 2 2015+2016 proton-proton collision data beta release, 1LMET30 skim from the ATLAS experiment"
},
"accelerator": "CERN-LHC",
"categories": {
"source": "ATLAS Collaboration"
},
"collaboration": {
"name": "ATLAS collaboration"
},
"collections": [
"ATLAS-Primary-Datasets"
],
"collision_information": {
"energy": "13TeV",
"type": "pp"
},
"date_created": [
"2015",
"2016"
],
"date_published": "2025",
"date_reprocessed": "2020",
"distribution": {
"formats": [
"root"
],
"number_events": 605490333,
"number_files": 16,
"size": 143262134403
},
"doi": "10.7483/OPENDATA.ATLAS.KPYL.P0EE",
"experiment": [
"ATLAS"
],
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],
"license": {
"attribution": "CC0-1.0"
},
"methodology": {
"description": "<p>These data were created during LS2 as part of a major reprocessing campaign of the Run 2 data. All data were reprocessed using Athena Release 22, and new corresponding MC simulation samples were produced. These data and MC simulation datasets were processed into ROOT ntuple files from the DAOD_PHYSLITE format that is released as open data for research. For the files in this record, the following skimming selection was applied: At least one lepton with at least 7 GeV of p<sub>T</sub> and 30 GeV of missing transverse momentum (i.e. a leptonically-decaying W-boson enhanced selection)"
},
"publisher": "CERN Open Data Portal",
"recid": "93929",
"relations": [
{
"description": "For citing all the Open Data for Education and Outreach from this release, and to find other related datasets, please see",
"doi": "10.7483/OPENDATA.ATLAS.B5M9.44TN",
"recid": "93910",
"title": "ROOT ntuple format 2015-2016 proton-proton Open Data for Education and Outreach from the ATLAS experiment",
"type": "isChildOf"
}
],
"run_period": [
"2015",
"2016"
],
"title": "ATLAS ROOT ntuple format Run 2 2015+2016 proton-proton collision data beta release, 1LMET30 skim",
"type": {
"primary": "Dataset",
"secondary": [
"Collision"
]
},
"usage": {
"description": "<p> The data and MC simulation provided by the ATLAS experiment in root ntuple format is released under a CC0 license; citation of the data and acknowledgement of the collaboration is requested. This format can be used directly using ROOT or uproot for simple studies and is primarily intended for educational and outreach purposes. <p>Extensive instructions for interacting with the data, as well as documentation of the dataset naming conventions and their contents, are provided on the ATLAS Open Data website linked below. For those interested in implementing a research-quality data analysis, the open data designed for research (also linked below) may be a better starting point. Please be sure to cite the Open Data that you use, in line with the policy below.",
"links": [
{
"description": "ATLAS Open Data Website",
"url": "http://opendata.atlas.cern"
},
{
"description": "Resources to understand and use the open data for education and outreach",
"url": "https://opendata.atlas.cern/docs/category/13-tev-2025-beta-release"
},
{
"description": "More about this ntuple format",
"url": "https://opendata.atlas.cern/docs/data/for_education/13TeV25_details#variable-list"
},
{
"description": "Ntuple making framework (PhysLiteToOpenData)",
"url": "https://doi.org/10.5281/zenodo.15791091"
},
{
"description": "Citation policy",
"url": "https://opendata.atlas.cern/docs/documentation/ethical_legal/citation_policy"
}
]
}
}
]
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