Abstract
The Compact Muon Solenoid (CMS) detector is described. Thedetector operates at the Large Hadron Collider (LHC) at CERN. It wasconceived to study proton-proton (and lead-lead) collisions at acentre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and atluminosities up to 1034 cm−2 s−1 (1027 cm−2 s−1). At the core of the CMS detector sits ahigh-magnetic-field and large-bore superconducting solenoidsurrounding an all-silicon pixel and strip tracker, a lead-tungstatescintillating-crystals electromagnetic calorimeter, and abrass-scintillator sampling hadron calorimeter. The iron yoke of theflux-return is instrumented with four stations of muon detectorscovering most of the 4π solid angle. Forward samplingcalorimeters extend the pseudorapidity coverage to high values(|η| ⩽ 5) assuring very good hermeticity. The overalldimensions of the CMS detector are a length of 21.6 m, a diameter of14.6 m and a total weight of 12500 t.
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