Performance of the CMS Cathode Strip Chambers with Cosmic Rays

TL;DR

This paper evaluates the performance of CMS Cathode Strip Chambers using cosmic ray data, demonstrating high efficiency, low noise, and precise timing and coordinate resolution in a real experimental setting.

Contribution

It provides the first comprehensive performance assessment of CMS CSCs with cosmic rays, including noise, resolution, and efficiency measurements.

Findings

Noise levels are below 1%.

Coordinate resolution ranges from 47 to 243 microns.

Detection efficiencies exceed 99%.

Abstract

The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns.