Alignment of the CMS Silicon Tracker during Commissioning with Cosmic Rays

Abstract

The CMS silicon tracker, consisting of 1440 silicon pixel and 15148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to a precision of 3-4 microns RMS in the barrel and 3-14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several methods, including the laser alignment system, and compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.

References in corpus (5)

• Commissioning of the CMS Experiment and the Cosmic Run at Four Tesla
• Commissioning and Performance of the CMS Pixel Tracker with Cosmic Ray Muons
• Commissioning and Performance of the CMS Silicon Strip Tracker with Cosmic Ray Muons
• Parametrization of the Cosmic Muon Flux for the Generator CMSCGEN
• Alignment of the CMS Silicon Strip Tracker during stand-alone Commissioning

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