Time Reconstruction and Performance of the CMS Electromagnetic Calorimeter
CMS Collaboration
TL;DR
This paper evaluates the timing resolution and synchronization accuracy of the CMS electromagnetic calorimeter using various data sources, demonstrating a time resolution better than 100 ps for high-energy deposits and achieving 500 ps crystal synchronization.
Contribution
It provides detailed measurements of the calorimeter's timing performance and demonstrates successful synchronization techniques using early LHC beam data.
Findings
Time resolution better than 100 ps for deposits >10 GeV
Crystal-to-crystal synchronization precision of 500 ps
Effective timing calibration using test beam, cosmic rays, and LHC muons
Abstract
The resolution and the linearity of time measurements made with the CMS electromagnetic calorimeter are studied with samples of data from test beam electrons, cosmic rays, and beam-produced muons. The resulting time resolution measured by lead tungstate crystals is better than 100 ps for energy deposits larger than 10 GeV. Crystal-to-crystal synchronization with a precision of 500 ps is performed using muons produced with the first LHC beams in 2008.
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