The Compact Muon Solenoid (CMS) Experiment is one of the large particle detectors at CERN's Large Hadron Collider. The CMS Collaboration consists of more than 3000 scientists, engineers, technicians and students from 180+ institutes and universities from 40+ countries. You can find more information about the CMS detector design and overview on the official CMS website.
You can find usage instructions and suggestions of CMS Open Data in two detailed guides:
This page gives a brief overview of CMS Open Data contents:
The following are provided through this portal: