feat(docs): add ATLAS HI 2024 open data release announcement

Co-authored-by: Tibor Šimko <[email protected]>

data/docs/atlas-heavy-ion-open-data-for-research-release-2024/atlas-heavy-ion-open-data-for-research-release-2024.json

@@ -0,0 +1,20 @@
+[
+  {
+    "author": "ATLAS Collaboration",
+    "body": {
+      "content": "atlas-heavy-ion-open-data-for-research-release-2024.md",
+      "format": "md"
+    },
+    "date_published": "2024-12-13",
+    "experiment": ["ATLAS"],
+    "featured": 1,
+    "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)."
+    },
+    "slug": "atlas-heavy-ion-open-data-for-research-release-2024",
+    "title": "ATLAS releases first open data from heavy-ion collisions",
+    "type": {
+      "primary": "News"
+    }
+  }
+]

data/docs/atlas-heavy-ion-open-data-for-research-release-2024/atlas-heavy-ion-open-data-for-research-release-2024.md

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+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). Today’s
+release is the highest energy heavy-ion collision data ever made publicly
+available and the first LHC Run 2 heavy-ion open dataset. Researchers worldwide
+can now explore over four terabytes of open data – comprising 221 million
+collision events – unlocking new opportunities for scientific discussions.
+
+<p align="center">
+  <img src="/static/docs/atlas-heavy-ion-open-data-for-research-release-2024/ATLAS-HeavyIon-Events.jpg" width="60%" alt="ATLAS heavy ion events">
+  <br/><em>Two heavy-ion collision events from the new ATLAS Open dataset, occurring in close succession.</em>
+  <br/><em>On the left, a head-on collision of lead ions; on the right, a peripheral interaction where the ions glanced off each other.</em>
+</p>
+
+Heavy-ion collisions, such as those between lead nuclei, are markedly different
+from proton-proton collisions. “Their massive size leads to very different
+types of interactions,” says Zach Marshall of the ATLAS Open Data team. “While
+colliding protons is akin to smashing two garbage cans together, colliding lead
+ions is what happens when you drive two garbage trucks at each other.”
+
+Unlike colliding trucks, when lead ions smash together they can create a
+droplet of quark-gluon plasma (QGP). This is the state of matter believed to
+have existed in the early universe, shortly after the Big Bang. As this droplet
+of plasma cools and evaporates, it leaves behind a distinct energy signature in
+the ATLAS experiment that researchers can analyse.
+
+“Using the new open dataset,” continues Zach, “researchers can study these
+energy signatures to learn how the QGP forms and evaporates, as well as the
+intricate dynamics of particle interactions within this extreme environment.”
+In particular, this dataset offers the opportunity to study jet suppression, a
+phenomenon where high-energy particle jets lose energy as they pass through the
+QGP. Such suppression provides researchers with a window into the properties of
+the quark-gluon plasma.
+
+Releasing heavy-ion open data posed unique challenges for the ATLAS Open Data
+team. “Unlike proton-proton data, we needed to include lots of extra collision
+event information – from charged particle tracks to energy measurements in our
+far-forward detectors – as that is where details about the QGP’s behaviour are
+hidden,” explains Zach. “To achieve this, we developed a new open data format
+(DAOD_HION14), which includes all this information but can also be studied with
+the same tools as our proton-proton datasets.”
+
+Today’s release features “Minimum Bias” heavy-ion data, which includes a wide
+range of collision events from central, head-on collisions to glancing,
+ultra-peripheral interactions. Next year, ATLAS will release “Hard Probes”
+heavy-ion data collected in 2015, focusing on collision events triggered by
+high-energy particles such as Z bosons or top-quark pairs. To help researchers
+understand the unique characteristics of each open dataset, the release is also
+accompanied by documentation and simulated data.
+
+Earlier this year, ATLAS made public over 65 TB of proton-proton collisions in
+its first open dataset for research. Today’s release adds to this legacy,
+comprising approximately 20% of ATLAS’ total Pb-Pb dataset, and more releases
+are already in the pipeline. This commitment to openness reflects core values
+of the high-energy physics community: fostering accessibility, enhancing
+reproducibility, and driving scientific progress.
+
+As ATLAS continues to make its data publicly available, the potential for
+collaboration grows. Researchers worldwide are invited to explore this new
+dataset and join the exploration of the universe’s most extreme conditions.
+
+---
+
+_Are you a non-ATLAS researcher looking to collaborate with ATLAS? Get access to the most recent ATLAS data by becoming a short-term associate. [Click here to learn more](https://atlas.cern/Discover/Collaboration/External-Collaboration)._
+
+---
+
+## Find out more
+
+- [The ATLAS News Release](https://atlas.cern/Updates/News/Heavy-Ion-Open-Data)
+- [Access the New Heavy-Ion ATLAS Open Data](https://opendata.cern.ch/record/80035)
+- [Explore the ATLAS Open Data Portal](https://opendata.atlas.cern/)
+- [CERN Open Data Portal](https://opendata.cern/)

data/docs/atlas-open-data-for-research-release-2024/atlas-open-data-for-research-release-2024.json

@@ -9,7 +9,7 @@
     "experiment": [
       "ATLAS"
     ],
-    "featured": 2,
+    "featured": 3,
     "short_description": {
       "content": "Explore over 75 billion LHC collision events — from home"
     },

data/docs/cms-releases-2016data-2024/cms-releases-2016data-2024.json

@@ -9,7 +9,6 @@
     "experiment": [
       "CMS"
     ],
-    "featured": 3,
     "short_description": {
       "content": "CMS releases 13 TeV proton collision data from 2016"
     },

data/docs/delphi-data-release-2024/delphi-data-release-2024.json

@@ -9,10 +9,10 @@
     "experiment": [
       "DELPHI"
     ],
+    "featured": 2,
     "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."
     },
-    "featured": 1,
     "slug": "delphi-data-release-2024",
     "title": "DELPHI Collaboration releases its entire data collection",
     "type": {